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Finding the Fourth Proportional to 71.28, 98.40 and 45.36

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Solution

The fourth proportional to 71.28, 98.40 and 45.36 is: 62.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.28 : 98.40 = 45.36 : x
  2. Step 2: Convert to fraction form
    71.28/98.40 = 45.36/x
  3. Step 3: Cross multiply
    71.28x = 98.40 × 45.36
  4. Step 4: Simplify right side
    71.28x = 4,463.42
  5. Step 5: Solve for x
    x = 4,463.42/71.28
  6. Step 6: Final answer
    x = 62.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.