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Finding the Fourth Proportional to 880.56, 1,215.20 and 487.60

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Solution

The fourth proportional to 880.56, 1,215.20 and 487.60 is: 672.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.56 : 1,215.20 = 487.60 : x
  2. Step 2: Convert to fraction form
    880.56/1,215.20 = 487.60/x
  3. Step 3: Cross multiply
    880.56x = 1,215.20 × 487.60
  4. Step 4: Simplify right side
    880.56x = 592,529.70
  5. Step 5: Solve for x
    x = 592,529.70/880.56
  6. Step 6: Final answer
    x = 672.90

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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.