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Finding the Fourth Proportional to 21,340.78, 32,011.14 and 7,489.78

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Solution

The fourth proportional to 21,340.78, 32,011.14 and 7,489.78 is: 11,234.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,340.78 : 32,011.14 = 7,489.78 : x
  2. Step 2: Convert to fraction form
    21,340.78/32,011.14 = 7,489.78/x
  3. Step 3: Cross multiply
    21,340.78x = 32,011.14 × 7,489.78
  4. Step 4: Simplify right side
    21,340.78x = 239,756,396.15
  5. Step 5: Solve for x
    x = 239,756,396.15/21,340.78
  6. Step 6: Final answer
    x = 11,234.66

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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.