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Finding the Fourth Proportional to 15,256.80, 21,053.76 and 8,542.80

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Solution

The fourth proportional to 15,256.80, 21,053.76 and 8,542.80 is: 11,788.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,256.80 : 21,053.76 = 8,542.80 : x
  2. Step 2: Convert to fraction form
    15,256.80/21,053.76 = 8,542.80/x
  3. Step 3: Cross multiply
    15,256.80x = 21,053.76 × 8,542.80
  4. Step 4: Simplify right side
    15,256.80x = 179,858,060.93
  5. Step 5: Solve for x
    x = 179,858,060.93/15,256.80
  6. Step 6: Final answer
    x = 11,788.71

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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.