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Finding the Fourth Proportional to 54,280.80, 81,421.20 and 19,215.90

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Solution

The fourth proportional to 54,280.80, 81,421.20 and 19,215.90 is: 28,823.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,280.80 : 81,421.20 = 19,215.90 : x
  2. Step 2: Convert to fraction form
    54,280.80/81,421.20 = 19,215.90/x
  3. Step 3: Cross multiply
    54,280.80x = 81,421.20 × 19,215.90
  4. Step 4: Simplify right side
    54,280.80x = 1,564,581,637.08
  5. Step 5: Solve for x
    x = 1,564,581,637.08/54,280.80
  6. Step 6: Final answer
    x = 28,823.85

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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.