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Finding the Fourth Proportional to 285.38, 428.09 and 93

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Solution

The fourth proportional to 285.38, 428.09 and 93 is: 139.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.38 : 428.09 = 93 : x
  2. Step 2: Convert to fraction form
    285.38/428.09 = 93/x
  3. Step 3: Cross multiply
    285.38x = 428.09 × 93
  4. Step 4: Simplify right side
    285.38x = 39,811.91
  5. Step 5: Solve for x
    x = 39,811.91/285.38
  6. Step 6: Final answer
    x = 139.51

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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.