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Finding the Fourth Proportional to 28,245.64, 38,978.68 and 15,498.56

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Solution

The fourth proportional to 28,245.64, 38,978.68 and 15,498.56 is: 21,387.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.64 : 38,978.68 = 15,498.56 : x
  2. Step 2: Convert to fraction form
    28,245.64/38,978.68 = 15,498.56/x
  3. Step 3: Cross multiply
    28,245.64x = 38,978.68 × 15,498.56
  4. Step 4: Simplify right side
    28,245.64x = 604,113,410.70
  5. Step 5: Solve for x
    x = 604,113,410.70/28,245.64
  6. Step 6: Final answer
    x = 21,387.85

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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.