Home / 138,690.20-191,397.90-81,321.54

Finding the Fourth Proportional to 138,690.20, 191,397.90 and 81,321.54

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Solution

The fourth proportional to 138,690.20, 191,397.90 and 81,321.54 is: 112,226.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.20 : 191,397.90 = 81,321.54 : x
  2. Step 2: Convert to fraction form
    138,690.20/191,397.90 = 81,321.54/x
  3. Step 3: Cross multiply
    138,690.20x = 191,397.90 × 81,321.54
  4. Step 4: Simplify right side
    138,690.20x = 15,564,771,574.16
  5. Step 5: Solve for x
    x = 15,564,771,574.16/138,690.20
  6. Step 6: Final answer
    x = 112,226.91

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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.