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Finding the Fourth Proportional to 100.83, 139.20 and 63.99

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Solution

The fourth proportional to 100.83, 139.20 and 63.99 is: 88.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.83 : 139.20 = 63.99 : x
  2. Step 2: Convert to fraction form
    100.83/139.20 = 63.99/x
  3. Step 3: Cross multiply
    100.83x = 139.20 × 63.99
  4. Step 4: Simplify right side
    100.83x = 8,907.53
  5. Step 5: Solve for x
    x = 8,907.53/100.83
  6. Step 6: Final answer
    x = 88.34

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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.