Home / 121,159.20-181,738.80-87,981.60

Finding the Fourth Proportional to 121,159.20, 181,738.80 and 87,981.60

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Solution

The fourth proportional to 121,159.20, 181,738.80 and 87,981.60 is: 131,972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,159.20 : 181,738.80 = 87,981.60 : x
  2. Step 2: Convert to fraction form
    121,159.20/181,738.80 = 87,981.60/x
  3. Step 3: Cross multiply
    121,159.20x = 181,738.80 × 87,981.60
  4. Step 4: Simplify right side
    121,159.20x = 15,989,670,406.08
  5. Step 5: Solve for x
    x = 15,989,670,406.08/121,159.20
  6. Step 6: Final answer
    x = 131,972.40

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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.