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Finding the Fourth Proportional to 880.59, 1,215.19 and 487.61

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Solution

The fourth proportional to 880.59, 1,215.19 and 487.61 is: 672.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.59 : 1,215.19 = 487.61 : x
  2. Step 2: Convert to fraction form
    880.59/1,215.19 = 487.61/x
  3. Step 3: Cross multiply
    880.59x = 1,215.19 × 487.61
  4. Step 4: Simplify right side
    880.59x = 592,538.80
  5. Step 5: Solve for x
    x = 592,538.80/880.59
  6. Step 6: Final answer
    x = 672.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.