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Finding the Fourth Proportional to 1,113.66, 1,535.84 and 938.70

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Solution

The fourth proportional to 1,113.66, 1,535.84 and 938.70 is: 1,294.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.66 : 1,535.84 = 938.70 : x
  2. Step 2: Convert to fraction form
    1,113.66/1,535.84 = 938.70/x
  3. Step 3: Cross multiply
    1,113.66x = 1,535.84 × 938.70
  4. Step 4: Simplify right side
    1,113.66x = 1,441,693.01
  5. Step 5: Solve for x
    x = 1,441,693.01/1,113.66
  6. Step 6: Final answer
    x = 1,294.55

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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.