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Finding the Fourth Proportional to 147.96, 221.78 and 56.56

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Solution

The fourth proportional to 147.96, 221.78 and 56.56 is: 84.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.96 : 221.78 = 56.56 : x
  2. Step 2: Convert to fraction form
    147.96/221.78 = 56.56/x
  3. Step 3: Cross multiply
    147.96x = 221.78 × 56.56
  4. Step 4: Simplify right side
    147.96x = 12,543.88
  5. Step 5: Solve for x
    x = 12,543.88/147.96
  6. Step 6: Final answer
    x = 84.78

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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.