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Finding the Fourth Proportional to 1,113.92, 1,532.12 and 913.30

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Solution

The fourth proportional to 1,113.92, 1,532.12 and 913.30 is: 1,256.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.92 : 1,532.12 = 913.30 : x
  2. Step 2: Convert to fraction form
    1,113.92/1,532.12 = 913.30/x
  3. Step 3: Cross multiply
    1,113.92x = 1,532.12 × 913.30
  4. Step 4: Simplify right side
    1,113.92x = 1,399,285.20
  5. Step 5: Solve for x
    x = 1,399,285.20/1,113.92
  6. Step 6: Final answer
    x = 1,256.18

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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.