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Finding the Fourth Proportional to 938.40, 1,294.98 and 518.76

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Solution

The fourth proportional to 938.40, 1,294.98 and 518.76 is: 715.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.40 : 1,294.98 = 518.76 : x
  2. Step 2: Convert to fraction form
    938.40/1,294.98 = 518.76/x
  3. Step 3: Cross multiply
    938.40x = 1,294.98 × 518.76
  4. Step 4: Simplify right side
    938.40x = 671,783.82
  5. Step 5: Solve for x
    x = 671,783.82/938.40
  6. Step 6: Final answer
    x = 715.88

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Double scale
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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.