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Finding the Fourth Proportional to 139,916.20, 209,874.30 and 137,000.20

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Solution

The fourth proportional to 139,916.20, 209,874.30 and 137,000.20 is: 205,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,916.20 : 209,874.30 = 137,000.20 : x
  2. Step 2: Convert to fraction form
    139,916.20/209,874.30 = 137,000.20/x
  3. Step 3: Cross multiply
    139,916.20x = 209,874.30 × 137,000.20
  4. Step 4: Simplify right side
    139,916.20x = 28,752,821,074.86
  5. Step 5: Solve for x
    x = 28,752,821,074.86/139,916.20
  6. Step 6: Final answer
    x = 205,500.30

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1.5x scale

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.