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Finding the Fourth Proportional to 938.79, 1,294.74 and 703.29

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Solution

The fourth proportional to 938.79, 1,294.74 and 703.29 is: 969.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.79 : 1,294.74 = 703.29 : x
  2. Step 2: Convert to fraction form
    938.79/1,294.74 = 703.29/x
  3. Step 3: Cross multiply
    938.79x = 1,294.74 × 703.29
  4. Step 4: Simplify right side
    938.79x = 910,572.70
  5. Step 5: Solve for x
    x = 910,572.70/938.79
  6. Step 6: Final answer
    x = 969.95

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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.