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Finding the Fourth Proportional to 139.94, 209.92 and 58.78

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Solution

The fourth proportional to 139.94, 209.92 and 58.78 is: 88.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.94 : 209.92 = 58.78 : x
  2. Step 2: Convert to fraction form
    139.94/209.92 = 58.78/x
  3. Step 3: Cross multiply
    139.94x = 209.92 × 58.78
  4. Step 4: Simplify right side
    139.94x = 12,339.10
  5. Step 5: Solve for x
    x = 12,339.10/139.94
  6. Step 6: Final answer
    x = 88.17

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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.