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Finding the Fourth Proportional to 487.60, 672.88 and 291.12

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Solution

The fourth proportional to 487.60, 672.88 and 291.12 is: 401.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.60 : 672.88 = 291.12 : x
  2. Step 2: Convert to fraction form
    487.60/672.88 = 291.12/x
  3. Step 3: Cross multiply
    487.60x = 672.88 × 291.12
  4. Step 4: Simplify right side
    487.60x = 195,888.83
  5. Step 5: Solve for x
    x = 195,888.83/487.60
  6. Step 6: Final answer
    x = 401.74

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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.