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Finding the Fourth Proportional to 104.47, 143.90 and 86.95

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Solution

The fourth proportional to 104.47, 143.90 and 86.95 is: 119.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.47 : 143.90 = 86.95 : x
  2. Step 2: Convert to fraction form
    104.47/143.90 = 86.95/x
  3. Step 3: Cross multiply
    104.47x = 143.90 × 86.95
  4. Step 4: Simplify right side
    104.47x = 12,510.95
  5. Step 5: Solve for x
    x = 12,510.95/104.47
  6. Step 6: Final answer
    x = 119.76

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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.