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Finding the Fourth Proportional to 100.98, 139.34 and 68.24

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Solution

The fourth proportional to 100.98, 139.34 and 68.24 is: 94.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.98 : 139.34 = 68.24 : x
  2. Step 2: Convert to fraction form
    100.98/139.34 = 68.24/x
  3. Step 3: Cross multiply
    100.98x = 139.34 × 68.24
  4. Step 4: Simplify right side
    100.98x = 9,509.08
  5. Step 5: Solve for x
    x = 9,509.08/100.98
  6. Step 6: Final answer
    x = 94.17

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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.