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Finding the Fourth Proportional to 28,129.68, 38,819.52 and 15,554.88

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Solution

The fourth proportional to 28,129.68, 38,819.52 and 15,554.88 is: 21,466.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,129.68 : 38,819.52 = 15,554.88 : x
  2. Step 2: Convert to fraction form
    28,129.68/38,819.52 = 15,554.88/x
  3. Step 3: Cross multiply
    28,129.68x = 38,819.52 × 15,554.88
  4. Step 4: Simplify right side
    28,129.68x = 603,832,975.26
  5. Step 5: Solve for x
    x = 603,832,975.26/28,129.68
  6. Step 6: Final answer
    x = 21,466.04

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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.