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Finding the Fourth Proportional to 158.60, 218.76 and 139.16

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Solution

The fourth proportional to 158.60, 218.76 and 139.16 is: 191.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.60 : 218.76 = 139.16 : x
  2. Step 2: Convert to fraction form
    158.60/218.76 = 139.16/x
  3. Step 3: Cross multiply
    158.60x = 218.76 × 139.16
  4. Step 4: Simplify right side
    158.60x = 30,442.64
  5. Step 5: Solve for x
    x = 30,442.64/158.60
  6. Step 6: Final answer
    x = 191.95

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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.