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Finding the Fourth Proportional to 34,871.78, 48,119.46 and 20,721.90

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Solution

The fourth proportional to 34,871.78, 48,119.46 and 20,721.90 is: 28,594.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    34,871.78 : 48,119.46 = 20,721.90 : x
  2. Step 2: Convert to fraction form
    34,871.78/48,119.46 = 20,721.90/x
  3. Step 3: Cross multiply
    34,871.78x = 48,119.46 × 20,721.90
  4. Step 4: Simplify right side
    34,871.78x = 997,126,638.17
  5. Step 5: Solve for x
    x = 997,126,638.17/34,871.78
  6. Step 6: Final answer
    x = 28,594.08

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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.