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Finding the Fourth Proportional to 139,543.60, 209,752.80 and 136,919.20

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Solution

The fourth proportional to 139,543.60, 209,752.80 and 136,919.20 is: 205,807.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,543.60 : 209,752.80 = 136,919.20 : x
  2. Step 2: Convert to fraction form
    139,543.60/209,752.80 = 136,919.20/x
  3. Step 3: Cross multiply
    139,543.60x = 209,752.80 × 136,919.20
  4. Step 4: Simplify right side
    139,543.60x = 28,719,185,573.76
  5. Step 5: Solve for x
    x = 28,719,185,573.76/139,543.60
  6. Step 6: Final answer
    x = 205,807.97

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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.