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Finding the Fourth Proportional to 761.49, 1,139.16 and 659.88

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Solution

The fourth proportional to 761.49, 1,139.16 and 659.88 is: 987.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.49 : 1,139.16 = 659.88 : x
  2. Step 2: Convert to fraction form
    761.49/1,139.16 = 659.88/x
  3. Step 3: Cross multiply
    761.49x = 1,139.16 × 659.88
  4. Step 4: Simplify right side
    761.49x = 751,708.90
  5. Step 5: Solve for x
    x = 751,708.90/761.49
  6. Step 6: Final answer
    x = 987.16

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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.