Home / 138,543.36-191,194.24-78,931.20

Finding the Fourth Proportional to 138,543.36, 191,194.24 and 78,931.20

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Solution

The fourth proportional to 138,543.36, 191,194.24 and 78,931.20 is: 108,927.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,543.36 : 191,194.24 = 78,931.20 : x
  2. Step 2: Convert to fraction form
    138,543.36/191,194.24 = 78,931.20/x
  3. Step 3: Cross multiply
    138,543.36x = 191,194.24 × 78,931.20
  4. Step 4: Simplify right side
    138,543.36x = 15,091,190,796.29
  5. Step 5: Solve for x
    x = 15,091,190,796.29/138,543.36
  6. Step 6: Final answer
    x = 108,927.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.