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Finding the Fourth Proportional to 20,646.69, 30,691.63 and 20,040.55

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Solution

The fourth proportional to 20,646.69, 30,691.63 and 20,040.55 is: 29,790.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.69 : 30,691.63 = 20,040.55 : x
  2. Step 2: Convert to fraction form
    20,646.69/30,691.63 = 20,040.55/x
  3. Step 3: Cross multiply
    20,646.69x = 30,691.63 × 20,040.55
  4. Step 4: Simplify right side
    20,646.69x = 615,077,145.60
  5. Step 5: Solve for x
    x = 615,077,145.60/20,646.69
  6. Step 6: Final answer
    x = 29,790.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.