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Finding the Fourth Proportional to 20,672.48, 30,990.25 and 7,515.58

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Solution

The fourth proportional to 20,672.48, 30,990.25 and 7,515.58 is: 11,266.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.48 : 30,990.25 = 7,515.58 : x
  2. Step 2: Convert to fraction form
    20,672.48/30,990.25 = 7,515.58/x
  3. Step 3: Cross multiply
    20,672.48x = 30,990.25 × 7,515.58
  4. Step 4: Simplify right side
    20,672.48x = 232,909,703.10
  5. Step 5: Solve for x
    x = 232,909,703.10/20,672.48
  6. Step 6: Final answer
    x = 11,266.66

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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.