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Finding the Fourth Proportional to 28,078.76, 38,748.70 and 15,503.52

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Solution

The fourth proportional to 28,078.76, 38,748.70 and 15,503.52 is: 21,394.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.76 : 38,748.70 = 15,503.52 : x
  2. Step 2: Convert to fraction form
    28,078.76/38,748.70 = 15,503.52/x
  3. Step 3: Cross multiply
    28,078.76x = 38,748.70 × 15,503.52
  4. Step 4: Simplify right side
    28,078.76x = 600,741,245.42
  5. Step 5: Solve for x
    x = 600,741,245.42/28,078.76
  6. Step 6: Final answer
    x = 21,394.86

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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.