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Finding the Fourth Proportional to 100.98, 139.36 and 62.17

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Solution

The fourth proportional to 100.98, 139.36 and 62.17 is: 85.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.98 : 139.36 = 62.17 : x
  2. Step 2: Convert to fraction form
    100.98/139.36 = 62.17/x
  3. Step 3: Cross multiply
    100.98x = 139.36 × 62.17
  4. Step 4: Simplify right side
    100.98x = 8,664.01
  5. Step 5: Solve for x
    x = 8,664.01/100.98
  6. Step 6: Final answer
    x = 85.80

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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.