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Finding the Fourth Proportional to 20,642.10, 30,959.55 and 7,487.70

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Solution

The fourth proportional to 20,642.10, 30,959.55 and 7,487.70 is: 11,230.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.10 : 30,959.55 = 7,487.70 : x
  2. Step 2: Convert to fraction form
    20,642.10/30,959.55 = 7,487.70/x
  3. Step 3: Cross multiply
    20,642.10x = 30,959.55 × 7,487.70
  4. Step 4: Simplify right side
    20,642.10x = 231,815,822.54
  5. Step 5: Solve for x
    x = 231,815,822.54/20,642.10
  6. Step 6: Final answer
    x = 11,230.24

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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.