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Finding the Fourth Proportional to 72.50, 99.81 and 62.12

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Solution

The fourth proportional to 72.50, 99.81 and 62.12 is: 85.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.50 : 99.81 = 62.12 : x
  2. Step 2: Convert to fraction form
    72.50/99.81 = 62.12/x
  3. Step 3: Cross multiply
    72.50x = 99.81 × 62.12
  4. Step 4: Simplify right side
    72.50x = 6,199.71
  5. Step 5: Solve for x
    x = 6,199.71/72.50
  6. Step 6: Final answer
    x = 85.52

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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.