Home / 21,306.68-29,405.40-12,811.56

Finding the Fourth Proportional to 21,306.68, 29,405.40 and 12,811.56

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Solution

The fourth proportional to 21,306.68, 29,405.40 and 12,811.56 is: 17,681.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,306.68 : 29,405.40 = 12,811.56 : x
  2. Step 2: Convert to fraction form
    21,306.68/29,405.40 = 12,811.56/x
  3. Step 3: Cross multiply
    21,306.68x = 29,405.40 × 12,811.56
  4. Step 4: Simplify right side
    21,306.68x = 376,729,046.42
  5. Step 5: Solve for x
    x = 376,729,046.42/21,306.68
  6. Step 6: Final answer
    x = 17,681.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.