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Finding the Fourth Proportional to 854.99, 1,281.47 and 392.39

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Solution

The fourth proportional to 854.99, 1,281.47 and 392.39 is: 588.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.99 : 1,281.47 = 392.39 : x
  2. Step 2: Convert to fraction form
    854.99/1,281.47 = 392.39/x
  3. Step 3: Cross multiply
    854.99x = 1,281.47 × 392.39
  4. Step 4: Simplify right side
    854.99x = 502,829.61
  5. Step 5: Solve for x
    x = 502,829.61/854.99
  6. Step 6: Final answer
    x = 588.11

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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.