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Finding the Fourth Proportional to 139.63, 209.38 and 52.98

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Solution

The fourth proportional to 139.63, 209.38 and 52.98 is: 79.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.63 : 209.38 = 52.98 : x
  2. Step 2: Convert to fraction form
    139.63/209.38 = 52.98/x
  3. Step 3: Cross multiply
    139.63x = 209.38 × 52.98
  4. Step 4: Simplify right side
    139.63x = 11,092.95
  5. Step 5: Solve for x
    x = 11,092.95/139.63
  6. Step 6: Final answer
    x = 79.45

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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.