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Finding the Fourth Proportional to 147.55, 221.47 and 74.47

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Solution

The fourth proportional to 147.55, 221.47 and 74.47 is: 111.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.55 : 221.47 = 74.47 : x
  2. Step 2: Convert to fraction form
    147.55/221.47 = 74.47/x
  3. Step 3: Cross multiply
    147.55x = 221.47 × 74.47
  4. Step 4: Simplify right side
    147.55x = 16,492.87
  5. Step 5: Solve for x
    x = 16,492.87/147.55
  6. Step 6: Final answer
    x = 111.78

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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.