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Finding the Fourth Proportional to 855.59, 1,282.35 and 392.90

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Solution

The fourth proportional to 855.59, 1,282.35 and 392.90 is: 588.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.59 : 1,282.35 = 392.90 : x
  2. Step 2: Convert to fraction form
    855.59/1,282.35 = 392.90/x
  3. Step 3: Cross multiply
    855.59x = 1,282.35 × 392.90
  4. Step 4: Simplify right side
    855.59x = 503,835.32
  5. Step 5: Solve for x
    x = 503,835.32/855.59
  6. Step 6: Final answer
    x = 588.87

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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.