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Finding the Fourth Proportional to 28,461.88, 42,687.92 and 7,680.52

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Solution

The fourth proportional to 28,461.88, 42,687.92 and 7,680.52 is: 11,519.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,461.88 : 42,687.92 = 7,680.52 : x
  2. Step 2: Convert to fraction form
    28,461.88/42,687.92 = 7,680.52/x
  3. Step 3: Cross multiply
    28,461.88x = 42,687.92 × 7,680.52
  4. Step 4: Simplify right side
    28,461.88x = 327,865,423.32
  5. Step 5: Solve for x
    x = 327,865,423.32/28,461.88
  6. Step 6: Final answer
    x = 11,519.46

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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.