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Finding the Fourth Proportional to 20,155.70, 30,233.55 and 11,407.70

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Solution

The fourth proportional to 20,155.70, 30,233.55 and 11,407.70 is: 17,111.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,155.70 : 30,233.55 = 11,407.70 : x
  2. Step 2: Convert to fraction form
    20,155.70/30,233.55 = 11,407.70/x
  3. Step 3: Cross multiply
    20,155.70x = 30,233.55 × 11,407.70
  4. Step 4: Simplify right side
    20,155.70x = 344,895,268.34
  5. Step 5: Solve for x
    x = 344,895,268.34/20,155.70
  6. Step 6: Final answer
    x = 17,111.55

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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.