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Finding the Fourth Proportional to 139.76, 209.58 and 53.12

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Solution

The fourth proportional to 139.76, 209.58 and 53.12 is: 79.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.76 : 209.58 = 53.12 : x
  2. Step 2: Convert to fraction form
    139.76/209.58 = 53.12/x
  3. Step 3: Cross multiply
    139.76x = 209.58 × 53.12
  4. Step 4: Simplify right side
    139.76x = 11,132.89
  5. Step 5: Solve for x
    x = 11,132.89/139.76
  6. Step 6: Final answer
    x = 79.66

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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.