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Finding the Fourth Proportional to 28,244.97, 38,978.47 and 15,499.41

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Solution

The fourth proportional to 28,244.97, 38,978.47 and 15,499.41 is: 21,389.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,244.97 : 38,978.47 = 15,499.41 : x
  2. Step 2: Convert to fraction form
    28,244.97/38,978.47 = 15,499.41/x
  3. Step 3: Cross multiply
    28,244.97x = 38,978.47 × 15,499.41
  4. Step 4: Simplify right side
    28,244.97x = 604,143,287.70
  5. Step 5: Solve for x
    x = 604,143,287.70/28,244.97
  6. Step 6: Final answer
    x = 21,389.41

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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.