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Finding the Fourth Proportional to 20,876.81, 28,848.17 and 15,201.70

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Solution

The fourth proportional to 20,876.81, 28,848.17 and 15,201.70 is: 21,006.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.81 : 28,848.17 = 15,201.70 : x
  2. Step 2: Convert to fraction form
    20,876.81/28,848.17 = 15,201.70/x
  3. Step 3: Cross multiply
    20,876.81x = 28,848.17 × 15,201.70
  4. Step 4: Simplify right side
    20,876.81x = 438,541,191.77
  5. Step 5: Solve for x
    x = 438,541,191.77/20,876.81
  6. Step 6: Final answer
    x = 21,006.14

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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.