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Finding the Fourth Proportional to 386,969.04, 580,543.56 and 120,715.20

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Solution

The fourth proportional to 386,969.04, 580,543.56 and 120,715.20 is: 181,100.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,969.04 : 580,543.56 = 120,715.20 : x
  2. Step 2: Convert to fraction form
    386,969.04/580,543.56 = 120,715.20/x
  3. Step 3: Cross multiply
    386,969.04x = 580,543.56 × 120,715.20
  4. Step 4: Simplify right side
    386,969.04x = 70,080,431,954.11
  5. Step 5: Solve for x
    x = 70,080,431,954.11/386,969.04
  6. Step 6: Final answer
    x = 181,100.88

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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.