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Finding the Fourth Proportional to 659.70, 987.42 and 577.70

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Solution

The fourth proportional to 659.70, 987.42 and 577.70 is: 864.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.70 : 987.42 = 577.70 : x
  2. Step 2: Convert to fraction form
    659.70/987.42 = 577.70/x
  3. Step 3: Cross multiply
    659.70x = 987.42 × 577.70
  4. Step 4: Simplify right side
    659.70x = 570,432.53
  5. Step 5: Solve for x
    x = 570,432.53/659.70
  6. Step 6: Final answer
    x = 864.68

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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.