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Finding the Fourth Proportional to 854.62, 1,280.85 and 392.26

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Solution

The fourth proportional to 854.62, 1,280.85 and 392.26 is: 587.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.62 : 1,280.85 = 392.26 : x
  2. Step 2: Convert to fraction form
    854.62/1,280.85 = 392.26/x
  3. Step 3: Cross multiply
    854.62x = 1,280.85 × 392.26
  4. Step 4: Simplify right side
    854.62x = 502,426.22
  5. Step 5: Solve for x
    x = 502,426.22/854.62
  6. Step 6: Final answer
    x = 587.89

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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.