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Finding the Fourth Proportional to 139,712.20, 209,552.10 and 39,887.80

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Solution

The fourth proportional to 139,712.20, 209,552.10 and 39,887.80 is: 59,827.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,712.20 : 209,552.10 = 39,887.80 : x
  2. Step 2: Convert to fraction form
    139,712.20/209,552.10 = 39,887.80/x
  3. Step 3: Cross multiply
    139,712.20x = 209,552.10 × 39,887.80
  4. Step 4: Simplify right side
    139,712.20x = 8,358,572,254.38
  5. Step 5: Solve for x
    x = 8,358,572,254.38/139,712.20
  6. Step 6: Final answer
    x = 59,827.07

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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.