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Finding the Fourth Proportional to 880.62, 1,215.21 and 487.64

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Solution

The fourth proportional to 880.62, 1,215.21 and 487.64 is: 672.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.62 : 1,215.21 = 487.64 : x
  2. Step 2: Convert to fraction form
    880.62/1,215.21 = 487.64/x
  3. Step 3: Cross multiply
    880.62x = 1,215.21 × 487.64
  4. Step 4: Simplify right side
    880.62x = 592,585.00
  5. Step 5: Solve for x
    x = 592,585.00/880.62
  6. Step 6: Final answer
    x = 672.92

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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.