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Finding the Fourth Proportional to 139,718.28, 209,645.46 and 69,607.92

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Solution

The fourth proportional to 139,718.28, 209,645.46 and 69,607.92 is: 104,445.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,718.28 : 209,645.46 = 69,607.92 : x
  2. Step 2: Convert to fraction form
    139,718.28/209,645.46 = 69,607.92/x
  3. Step 3: Cross multiply
    139,718.28x = 209,645.46 × 69,607.92
  4. Step 4: Simplify right side
    139,718.28x = 14,592,984,408.04
  5. Step 5: Solve for x
    x = 14,592,984,408.04/139,718.28
  6. Step 6: Final answer
    x = 104,445.78

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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.