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Finding the Fourth Proportional to 21,878.92, 30,279.54 and 21,354.76

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Solution

The fourth proportional to 21,878.92, 30,279.54 and 21,354.76 is: 29,554.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.92 : 30,279.54 = 21,354.76 : x
  2. Step 2: Convert to fraction form
    21,878.92/30,279.54 = 21,354.76/x
  3. Step 3: Cross multiply
    21,878.92x = 30,279.54 × 21,354.76
  4. Step 4: Simplify right side
    21,878.92x = 646,612,309.61
  5. Step 5: Solve for x
    x = 646,612,309.61/21,878.92
  6. Step 6: Final answer
    x = 29,554.12

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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.