Home / 81,979.10-122,968.65-80,812.70

Finding the Fourth Proportional to 81,979.10, 122,968.65 and 80,812.70

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Solution

The fourth proportional to 81,979.10, 122,968.65 and 80,812.70 is: 121,219.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,979.10 : 122,968.65 = 80,812.70 : x
  2. Step 2: Convert to fraction form
    81,979.10/122,968.65 = 80,812.70/x
  3. Step 3: Cross multiply
    81,979.10x = 122,968.65 × 80,812.70
  4. Step 4: Simplify right side
    81,979.10x = 9,937,428,621.86
  5. Step 5: Solve for x
    x = 9,937,428,621.86/81,979.10
  6. Step 6: Final answer
    x = 121,219.05

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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.