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Finding the Fourth Proportional to 28,728.40, 42,995.40 and 25,229.20

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Solution

The fourth proportional to 28,728.40, 42,995.40 and 25,229.20 is: 37,758.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,728.40 : 42,995.40 = 25,229.20 : x
  2. Step 2: Convert to fraction form
    28,728.40/42,995.40 = 25,229.20/x
  3. Step 3: Cross multiply
    28,728.40x = 42,995.40 × 25,229.20
  4. Step 4: Simplify right side
    28,728.40x = 1,084,739,545.68
  5. Step 5: Solve for x
    x = 1,084,739,545.68/28,728.40
  6. Step 6: Final answer
    x = 37,758.44

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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.