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Finding the Fourth Proportional to 659.88, 987.12 and 454.50

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Solution

The fourth proportional to 659.88, 987.12 and 454.50 is: 679.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.88 : 987.12 = 454.50 : x
  2. Step 2: Convert to fraction form
    659.88/987.12 = 454.50/x
  3. Step 3: Cross multiply
    659.88x = 987.12 × 454.50
  4. Step 4: Simplify right side
    659.88x = 448,646.04
  5. Step 5: Solve for x
    x = 448,646.04/659.88
  6. Step 6: Final answer
    x = 679.89

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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.