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Finding the Fourth Proportional to 82,703.10, 124,054.65 and 81,390.90

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Solution

The fourth proportional to 82,703.10, 124,054.65 and 81,390.90 is: 122,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,703.10 : 124,054.65 = 81,390.90 : x
  2. Step 2: Convert to fraction form
    82,703.10/124,054.65 = 81,390.90/x
  3. Step 3: Cross multiply
    82,703.10x = 124,054.65 × 81,390.90
  4. Step 4: Simplify right side
    82,703.10x = 10,096,919,612.69
  5. Step 5: Solve for x
    x = 10,096,919,612.69/82,703.10
  6. Step 6: Final answer
    x = 122,086.35

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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.