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Finding the Fourth Proportional to 938.18, 1,294.90 and 627.50

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Solution

The fourth proportional to 938.18, 1,294.90 and 627.50 is: 866.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.18 : 1,294.90 = 627.50 : x
  2. Step 2: Convert to fraction form
    938.18/1,294.90 = 627.50/x
  3. Step 3: Cross multiply
    938.18x = 1,294.90 × 627.50
  4. Step 4: Simplify right side
    938.18x = 812,549.75
  5. Step 5: Solve for x
    x = 812,549.75/938.18
  6. Step 6: Final answer
    x = 866.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.