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Finding the Fourth Proportional to 6,607.50, 9,912.90 and 1,990.50

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Solution

The fourth proportional to 6,607.50, 9,912.90 and 1,990.50 is: 2,986.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,607.50 : 9,912.90 = 1,990.50 : x
  2. Step 2: Convert to fraction form
    6,607.50/9,912.90 = 1,990.50/x
  3. Step 3: Cross multiply
    6,607.50x = 9,912.90 × 1,990.50
  4. Step 4: Simplify right side
    6,607.50x = 19,731,627.45
  5. Step 5: Solve for x
    x = 19,731,627.45/6,607.50
  6. Step 6: Final answer
    x = 2,986.25

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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.