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Finding the Fourth Proportional to 28,439.71, 42,659.71 and 7,378.29

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Solution

The fourth proportional to 28,439.71, 42,659.71 and 7,378.29 is: 11,067.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,439.71 : 42,659.71 = 7,378.29 : x
  2. Step 2: Convert to fraction form
    28,439.71/42,659.71 = 7,378.29/x
  3. Step 3: Cross multiply
    28,439.71x = 42,659.71 × 7,378.29
  4. Step 4: Simplify right side
    28,439.71x = 314,755,734.75
  5. Step 5: Solve for x
    x = 314,755,734.75/28,439.71
  6. Step 6: Final answer
    x = 11,067.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.