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Finding the Fourth Proportional to 7,775.70, 11,663.55 and 5,280.90

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Solution

The fourth proportional to 7,775.70, 11,663.55 and 5,280.90 is: 7,921.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,775.70 : 11,663.55 = 5,280.90 : x
  2. Step 2: Convert to fraction form
    7,775.70/11,663.55 = 5,280.90/x
  3. Step 3: Cross multiply
    7,775.70x = 11,663.55 × 5,280.90
  4. Step 4: Simplify right side
    7,775.70x = 61,594,041.20
  5. Step 5: Solve for x
    x = 61,594,041.20/7,775.70
  6. Step 6: Final answer
    x = 7,921.35

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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.