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Finding the Fourth Proportional to 25,456.80, 35,128.78 and 15,379.30

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Solution

The fourth proportional to 25,456.80, 35,128.78 and 15,379.30 is: 21,222.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,456.80 : 35,128.78 = 15,379.30 : x
  2. Step 2: Convert to fraction form
    25,456.80/35,128.78 = 15,379.30/x
  3. Step 3: Cross multiply
    25,456.80x = 35,128.78 × 15,379.30
  4. Step 4: Simplify right side
    25,456.80x = 540,256,046.25
  5. Step 5: Solve for x
    x = 540,256,046.25/25,456.80
  6. Step 6: Final answer
    x = 21,222.46

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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.