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Finding the Fourth Proportional to 1,117.60, 1,678.28 and 932.32

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Solution

The fourth proportional to 1,117.60, 1,678.28 and 932.32 is: 1,400.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.60 : 1,678.28 = 932.32 : x
  2. Step 2: Convert to fraction form
    1,117.60/1,678.28 = 932.32/x
  3. Step 3: Cross multiply
    1,117.60x = 1,678.28 × 932.32
  4. Step 4: Simplify right side
    1,117.60x = 1,564,694.01
  5. Step 5: Solve for x
    x = 1,564,694.01/1,117.60
  6. Step 6: Final answer
    x = 1,400.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.