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Finding the Fourth Proportional to 15,128.79, 20,876.01 and 8,414.01

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Solution

The fourth proportional to 15,128.79, 20,876.01 and 8,414.01 is: 11,610.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,128.79 : 20,876.01 = 8,414.01 : x
  2. Step 2: Convert to fraction form
    15,128.79/20,876.01 = 8,414.01/x
  3. Step 3: Cross multiply
    15,128.79x = 20,876.01 × 8,414.01
  4. Step 4: Simplify right side
    15,128.79x = 175,650,852.52
  5. Step 5: Solve for x
    x = 175,650,852.52/15,128.79
  6. Step 6: Final answer
    x = 11,610.37

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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.