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Finding the Fourth Proportional to 72.48, 100.20 and 62.88

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Solution

The fourth proportional to 72.48, 100.20 and 62.88 is: 86.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.48 : 100.20 = 62.88 : x
  2. Step 2: Convert to fraction form
    72.48/100.20 = 62.88/x
  3. Step 3: Cross multiply
    72.48x = 100.20 × 62.88
  4. Step 4: Simplify right side
    72.48x = 6,300.58
  5. Step 5: Solve for x
    x = 6,300.58/72.48
  6. Step 6: Final answer
    x = 86.93

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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.