Home / 165,430.15-247,981.20-81,121.30

Finding the Fourth Proportional to 165,430.15, 247,981.20 and 81,121.30

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Solution

The fourth proportional to 165,430.15, 247,981.20 and 81,121.30 is: 121,601.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    165,430.15 : 247,981.20 = 81,121.30 : x
  2. Step 2: Convert to fraction form
    165,430.15/247,981.20 = 81,121.30/x
  3. Step 3: Cross multiply
    165,430.15x = 247,981.20 × 81,121.30
  4. Step 4: Simplify right side
    165,430.15x = 20,116,557,319.56
  5. Step 5: Solve for x
    x = 20,116,557,319.56/165,430.15
  6. Step 6: Final answer
    x = 121,601.52

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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.