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Finding the Fourth Proportional to 285.07, 427.41 and 147.79

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Solution

The fourth proportional to 285.07, 427.41 and 147.79 is: 221.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.07 : 427.41 = 147.79 : x
  2. Step 2: Convert to fraction form
    285.07/427.41 = 147.79/x
  3. Step 3: Cross multiply
    285.07x = 427.41 × 147.79
  4. Step 4: Simplify right side
    285.07x = 63,166.92
  5. Step 5: Solve for x
    x = 63,166.92/285.07
  6. Step 6: Final answer
    x = 221.58

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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.