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Finding the Fourth Proportional to 28,001.36, 38,609.84 and 20,915.84

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Solution

The fourth proportional to 28,001.36, 38,609.84 and 20,915.84 is: 28,839.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,001.36 : 38,609.84 = 20,915.84 : x
  2. Step 2: Convert to fraction form
    28,001.36/38,609.84 = 20,915.84/x
  3. Step 3: Cross multiply
    28,001.36x = 38,609.84 × 20,915.84
  4. Step 4: Simplify right side
    28,001.36x = 807,557,235.87
  5. Step 5: Solve for x
    x = 807,557,235.87/28,001.36
  6. Step 6: Final answer
    x = 28,839.93

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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.