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Finding the Fourth Proportional to 28,648.80, 42,957.72 and 11,113.92

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Solution

The fourth proportional to 28,648.80, 42,957.72 and 11,113.92 is: 16,664.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,648.80 : 42,957.72 = 11,113.92 : x
  2. Step 2: Convert to fraction form
    28,648.80/42,957.72 = 11,113.92/x
  3. Step 3: Cross multiply
    28,648.80x = 42,957.72 × 11,113.92
  4. Step 4: Simplify right side
    28,648.80x = 477,428,663.46
  5. Step 5: Solve for x
    x = 477,428,663.46/28,648.80
  6. Step 6: Final answer
    x = 16,664.87

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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.