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Finding the Fourth Proportional to 983.31, 1,470.40 and 761.42

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Solution

The fourth proportional to 983.31, 1,470.40 and 761.42 is: 1,138.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.31 : 1,470.40 = 761.42 : x
  2. Step 2: Convert to fraction form
    983.31/1,470.40 = 761.42/x
  3. Step 3: Cross multiply
    983.31x = 1,470.40 × 761.42
  4. Step 4: Simplify right side
    983.31x = 1,119,591.97
  5. Step 5: Solve for x
    x = 1,119,591.97/983.31
  6. Step 6: Final answer
    x = 1,138.60

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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.