Home / 121,011.90-181,517.85-76,688.70

Finding the Fourth Proportional to 121,011.90, 181,517.85 and 76,688.70

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Solution

The fourth proportional to 121,011.90, 181,517.85 and 76,688.70 is: 115,033.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,011.90 : 181,517.85 = 76,688.70 : x
  2. Step 2: Convert to fraction form
    121,011.90/181,517.85 = 76,688.70/x
  3. Step 3: Cross multiply
    121,011.90x = 181,517.85 × 76,688.70
  4. Step 4: Simplify right side
    121,011.90x = 13,920,367,943.30
  5. Step 5: Solve for x
    x = 13,920,367,943.30/121,011.90
  6. Step 6: Final answer
    x = 115,033.05

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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.