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Finding the Fourth Proportional to 25,810.64, 38,721 and 8,279.12

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Solution

The fourth proportional to 25,810.64, 38,721 and 8,279.12 is: 12,420.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,810.64 : 38,721 = 8,279.12 : x
  2. Step 2: Convert to fraction form
    25,810.64/38,721 = 8,279.12/x
  3. Step 3: Cross multiply
    25,810.64x = 38,721 × 8,279.12
  4. Step 4: Simplify right side
    25,810.64x = 320,575,805.52
  5. Step 5: Solve for x
    x = 320,575,805.52/25,810.64
  6. Step 6: Final answer
    x = 12,420.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.