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Finding the Fourth Proportional to 47.96, 71.52 and 43.20

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Solution

The fourth proportional to 47.96, 71.52 and 43.20 is: 64.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.96 : 71.52 = 43.20 : x
  2. Step 2: Convert to fraction form
    47.96/71.52 = 43.20/x
  3. Step 3: Cross multiply
    47.96x = 71.52 × 43.20
  4. Step 4: Simplify right side
    47.96x = 3,089.66
  5. Step 5: Solve for x
    x = 3,089.66/47.96
  6. Step 6: Final answer
    x = 64.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.