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Finding the Fourth Proportional to 929.52, 1,280.61 and 869.04

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Solution

The fourth proportional to 929.52, 1,280.61 and 869.04 is: 1,197.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.52 : 1,280.61 = 869.04 : x
  2. Step 2: Convert to fraction form
    929.52/1,280.61 = 869.04/x
  3. Step 3: Cross multiply
    929.52x = 1,280.61 × 869.04
  4. Step 4: Simplify right side
    929.52x = 1,112,901.31
  5. Step 5: Solve for x
    x = 1,112,901.31/929.52
  6. Step 6: Final answer
    x = 1,197.29

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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.