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Finding the Fourth Proportional to 139,966.70, 209,950.05 and 138,001.10

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Solution

The fourth proportional to 139,966.70, 209,950.05 and 138,001.10 is: 207,001.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,966.70 : 209,950.05 = 138,001.10 : x
  2. Step 2: Convert to fraction form
    139,966.70/209,950.05 = 138,001.10/x
  3. Step 3: Cross multiply
    139,966.70x = 209,950.05 × 138,001.10
  4. Step 4: Simplify right side
    139,966.70x = 28,973,337,845.06
  5. Step 5: Solve for x
    x = 28,973,337,845.06/139,966.70
  6. Step 6: Final answer
    x = 207,001.65

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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.