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Finding the Fourth Proportional to 139,969.20, 209,953.80 and 77,761.20

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Solution

The fourth proportional to 139,969.20, 209,953.80 and 77,761.20 is: 116,641.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969.20 : 209,953.80 = 77,761.20 : x
  2. Step 2: Convert to fraction form
    139,969.20/209,953.80 = 77,761.20/x
  3. Step 3: Cross multiply
    139,969.20x = 209,953.80 × 77,761.20
  4. Step 4: Simplify right side
    139,969.20x = 16,326,259,432.56
  5. Step 5: Solve for x
    x = 16,326,259,432.56/139,969.20
  6. Step 6: Final answer
    x = 116,641.80

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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.