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Finding the Fourth Proportional to 854.12, 1,281.28 and 391.92

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Solution

The fourth proportional to 854.12, 1,281.28 and 391.92 is: 587.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.12 : 1,281.28 = 391.92 : x
  2. Step 2: Convert to fraction form
    854.12/1,281.28 = 391.92/x
  3. Step 3: Cross multiply
    854.12x = 1,281.28 × 391.92
  4. Step 4: Simplify right side
    854.12x = 502,159.26
  5. Step 5: Solve for x
    x = 502,159.26/854.12
  6. Step 6: Final answer
    x = 587.93

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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.