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Finding the Fourth Proportional to 87,215.40, 130,823.10 and 21,551.40

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Solution

The fourth proportional to 87,215.40, 130,823.10 and 21,551.40 is: 32,327.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,215.40 : 130,823.10 = 21,551.40 : x
  2. Step 2: Convert to fraction form
    87,215.40/130,823.10 = 21,551.40/x
  3. Step 3: Cross multiply
    87,215.40x = 130,823.10 × 21,551.40
  4. Step 4: Simplify right side
    87,215.40x = 2,819,420,957.34
  5. Step 5: Solve for x
    x = 2,819,420,957.34/87,215.40
  6. Step 6: Final answer
    x = 32,327.10

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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.