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Finding the Fourth Proportional to 139.07, 208.80 and 58.07

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Solution

The fourth proportional to 139.07, 208.80 and 58.07 is: 87.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.07 : 208.80 = 58.07 : x
  2. Step 2: Convert to fraction form
    139.07/208.80 = 58.07/x
  3. Step 3: Cross multiply
    139.07x = 208.80 × 58.07
  4. Step 4: Simplify right side
    139.07x = 12,123.97
  5. Step 5: Solve for x
    x = 12,123.97/139.07
  6. Step 6: Final answer
    x = 87.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.