Home / 81,390.15-121,921.20-54,818.10

Finding the Fourth Proportional to 81,390.15, 121,921.20 and 54,818.10

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Solution

The fourth proportional to 81,390.15, 121,921.20 and 54,818.10 is: 82,116.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.15 : 121,921.20 = 54,818.10 : x
  2. Step 2: Convert to fraction form
    81,390.15/121,921.20 = 54,818.10/x
  3. Step 3: Cross multiply
    81,390.15x = 121,921.20 × 54,818.10
  4. Step 4: Simplify right side
    81,390.15x = 6,683,488,533.72
  5. Step 5: Solve for x
    x = 6,683,488,533.72/81,390.15
  6. Step 6: Final answer
    x = 82,116.68

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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.