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Finding the Fourth Proportional to 28,015, 38,660.82 and 15,439.48

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Solution

The fourth proportional to 28,015, 38,660.82 and 15,439.48 is: 21,306.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,015 : 38,660.82 = 15,439.48 : x
  2. Step 2: Convert to fraction form
    28,015/38,660.82 = 15,439.48/x
  3. Step 3: Cross multiply
    28,015x = 38,660.82 × 15,439.48
  4. Step 4: Simplify right side
    28,015x = 596,902,957.17
  5. Step 5: Solve for x
    x = 596,902,957.17/28,015
  6. Step 6: Final answer
    x = 21,306.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.