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Finding the Fourth Proportional to 12,279.20, 18,418.80 and 5,703.20

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Solution

The fourth proportional to 12,279.20, 18,418.80 and 5,703.20 is: 8,554.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,279.20 : 18,418.80 = 5,703.20 : x
  2. Step 2: Convert to fraction form
    12,279.20/18,418.80 = 5,703.20/x
  3. Step 3: Cross multiply
    12,279.20x = 18,418.80 × 5,703.20
  4. Step 4: Simplify right side
    12,279.20x = 105,046,100.16
  5. Step 5: Solve for x
    x = 105,046,100.16/12,279.20
  6. Step 6: Final answer
    x = 8,554.80

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1.5x scale

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.