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Finding the Fourth Proportional to 285.60, 428.35 and 90.56

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Solution

The fourth proportional to 285.60, 428.35 and 90.56 is: 135.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.60 : 428.35 = 90.56 : x
  2. Step 2: Convert to fraction form
    285.60/428.35 = 90.56/x
  3. Step 3: Cross multiply
    285.60x = 428.35 × 90.56
  4. Step 4: Simplify right side
    285.60x = 38,791.38
  5. Step 5: Solve for x
    x = 38,791.38/285.60
  6. Step 6: Final answer
    x = 135.82

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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.