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Finding the Fourth Proportional to 10,607.70, 15,911.55 and 6,455.85

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Solution

The fourth proportional to 10,607.70, 15,911.55 and 6,455.85 is: 9,683.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,607.70 : 15,911.55 = 6,455.85 : x
  2. Step 2: Convert to fraction form
    10,607.70/15,911.55 = 6,455.85/x
  3. Step 3: Cross multiply
    10,607.70x = 15,911.55 × 6,455.85
  4. Step 4: Simplify right side
    10,607.70x = 102,722,580.07
  5. Step 5: Solve for x
    x = 102,722,580.07/10,607.70
  6. Step 6: Final answer
    x = 9,683.78

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.