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Finding the Fourth Proportional to 84,580.48, 126,870.34 and 21,401.20

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Solution

The fourth proportional to 84,580.48, 126,870.34 and 21,401.20 is: 32,101.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,580.48 : 126,870.34 = 21,401.20 : x
  2. Step 2: Convert to fraction form
    84,580.48/126,870.34 = 21,401.20/x
  3. Step 3: Cross multiply
    84,580.48x = 126,870.34 × 21,401.20
  4. Step 4: Simplify right side
    84,580.48x = 2,715,177,520.41
  5. Step 5: Solve for x
    x = 2,715,177,520.41/84,580.48
  6. Step 6: Final answer
    x = 32,101.70

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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.