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Finding the Fourth Proportional to 934.87, 1,402.34 and 285.61

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Solution

The fourth proportional to 934.87, 1,402.34 and 285.61 is: 428.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.87 : 1,402.34 = 285.61 : x
  2. Step 2: Convert to fraction form
    934.87/1,402.34 = 285.61/x
  3. Step 3: Cross multiply
    934.87x = 1,402.34 × 285.61
  4. Step 4: Simplify right side
    934.87x = 400,522.33
  5. Step 5: Solve for x
    x = 400,522.33/934.87
  6. Step 6: Final answer
    x = 428.43

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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.