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Finding the Fourth Proportional to 659.39, 989.05 and 475.15

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Solution

The fourth proportional to 659.39, 989.05 and 475.15 is: 712.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.39 : 989.05 = 475.15 : x
  2. Step 2: Convert to fraction form
    659.39/989.05 = 475.15/x
  3. Step 3: Cross multiply
    659.39x = 989.05 × 475.15
  4. Step 4: Simplify right side
    659.39x = 469,947.11
  5. Step 5: Solve for x
    x = 469,947.11/659.39
  6. Step 6: Final answer
    x = 712.70

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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.