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Finding the Fourth Proportional to 8,085.61, 12,128.42 and 2,539.45

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Solution

The fourth proportional to 8,085.61, 12,128.42 and 2,539.45 is: 3,809.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,085.61 : 12,128.42 = 2,539.45 : x
  2. Step 2: Convert to fraction form
    8,085.61/12,128.42 = 2,539.45/x
  3. Step 3: Cross multiply
    8,085.61x = 12,128.42 × 2,539.45
  4. Step 4: Simplify right side
    8,085.61x = 30,799,516.17
  5. Step 5: Solve for x
    x = 30,799,516.17/8,085.61
  6. Step 6: Final answer
    x = 3,809.18

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Double scale
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Similar ratio
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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.