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Finding the Fourth Proportional to 139,740.20, 209,610.30 and 112,092.20

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Solution

The fourth proportional to 139,740.20, 209,610.30 and 112,092.20 is: 168,138.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,740.20 : 209,610.30 = 112,092.20 : x
  2. Step 2: Convert to fraction form
    139,740.20/209,610.30 = 112,092.20/x
  3. Step 3: Cross multiply
    139,740.20x = 209,610.30 × 112,092.20
  4. Step 4: Simplify right side
    139,740.20x = 23,495,679,669.66
  5. Step 5: Solve for x
    x = 23,495,679,669.66/139,740.20
  6. Step 6: Final answer
    x = 168,138.30

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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.