Home / 121,012.90-181,519.35-76,689.70

Finding the Fourth Proportional to 121,012.90, 181,519.35 and 76,689.70

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Solution

The fourth proportional to 121,012.90, 181,519.35 and 76,689.70 is: 115,034.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,012.90 : 181,519.35 = 76,689.70 : x
  2. Step 2: Convert to fraction form
    121,012.90/181,519.35 = 76,689.70/x
  3. Step 3: Cross multiply
    121,012.90x = 181,519.35 × 76,689.70
  4. Step 4: Simplify right side
    121,012.90x = 13,920,664,495.70
  5. Step 5: Solve for x
    x = 13,920,664,495.70/121,012.90
  6. Step 6: Final answer
    x = 115,034.55

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1.5x scale

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.