Home / 120,981.10-181,508.10-85,989.10

Finding the Fourth Proportional to 120,981.10, 181,508.10 and 85,989.10

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Solution

The fourth proportional to 120,981.10, 181,508.10 and 85,989.10 is: 129,009.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,981.10 : 181,508.10 = 85,989.10 : x
  2. Step 2: Convert to fraction form
    120,981.10/181,508.10 = 85,989.10/x
  3. Step 3: Cross multiply
    120,981.10x = 181,508.10 × 85,989.10
  4. Step 4: Simplify right side
    120,981.10x = 15,607,718,161.71
  5. Step 5: Solve for x
    x = 15,607,718,161.71/120,981.10
  6. Step 6: Final answer
    x = 129,009.56

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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.