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Finding the Fourth Proportional to 285.09, 426.72 and 147.95

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Solution

The fourth proportional to 285.09, 426.72 and 147.95 is: 221.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.09 : 426.72 = 147.95 : x
  2. Step 2: Convert to fraction form
    285.09/426.72 = 147.95/x
  3. Step 3: Cross multiply
    285.09x = 426.72 × 147.95
  4. Step 4: Simplify right side
    285.09x = 63,131.63
  5. Step 5: Solve for x
    x = 63,131.63/285.09
  6. Step 6: Final answer
    x = 221.45

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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.