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Finding the Fourth Proportional to 54,581.40, 81,875.88 and 21,290.40

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Solution

The fourth proportional to 54,581.40, 81,875.88 and 21,290.40 is: 31,937.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,581.40 : 81,875.88 = 21,290.40 : x
  2. Step 2: Convert to fraction form
    54,581.40/81,875.88 = 21,290.40/x
  3. Step 3: Cross multiply
    54,581.40x = 81,875.88 × 21,290.40
  4. Step 4: Simplify right side
    54,581.40x = 1,743,170,235.55
  5. Step 5: Solve for x
    x = 1,743,170,235.55/54,581.40
  6. Step 6: Final answer
    x = 31,937.07

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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.