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Finding the Fourth Proportional to 139,856.62, 209,693.01 and 67,790.45

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Solution

The fourth proportional to 139,856.62, 209,693.01 and 67,790.45 is: 101,641.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,856.62 : 209,693.01 = 67,790.45 : x
  2. Step 2: Convert to fraction form
    139,856.62/209,693.01 = 67,790.45/x
  3. Step 3: Cross multiply
    139,856.62x = 209,693.01 × 67,790.45
  4. Step 4: Simplify right side
    139,856.62x = 14,215,183,509.75
  5. Step 5: Solve for x
    x = 14,215,183,509.75/139,856.62
  6. Step 6: Final answer
    x = 101,641.12

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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.