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Finding the Fourth Proportional to 28,064.34, 38,728.71 and 15,489

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Solution

The fourth proportional to 28,064.34, 38,728.71 and 15,489 is: 21,374.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,064.34 : 38,728.71 = 15,489 : x
  2. Step 2: Convert to fraction form
    28,064.34/38,728.71 = 15,489/x
  3. Step 3: Cross multiply
    28,064.34x = 38,728.71 × 15,489
  4. Step 4: Simplify right side
    28,064.34x = 599,868,989.19
  5. Step 5: Solve for x
    x = 599,868,989.19/28,064.34
  6. Step 6: Final answer
    x = 21,374.78

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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.