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Finding the Fourth Proportional to 19,605.20, 29,407.80 and 8,517.20

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Solution

The fourth proportional to 19,605.20, 29,407.80 and 8,517.20 is: 12,775.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,605.20 : 29,407.80 = 8,517.20 : x
  2. Step 2: Convert to fraction form
    19,605.20/29,407.80 = 8,517.20/x
  3. Step 3: Cross multiply
    19,605.20x = 29,407.80 × 8,517.20
  4. Step 4: Simplify right side
    19,605.20x = 250,472,114.16
  5. Step 5: Solve for x
    x = 250,472,114.16/19,605.20
  6. Step 6: Final answer
    x = 12,775.80

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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.