Home / 21,387.42-29,515.59-11,955.99

Finding the Fourth Proportional to 21,387.42, 29,515.59 and 11,955.99

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Solution

The fourth proportional to 21,387.42, 29,515.59 and 11,955.99 is: 16,499.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,387.42 : 29,515.59 = 11,955.99 : x
  2. Step 2: Convert to fraction form
    21,387.42/29,515.59 = 11,955.99/x
  3. Step 3: Cross multiply
    21,387.42x = 29,515.59 × 11,955.99
  4. Step 4: Simplify right side
    21,387.42x = 352,888,098.88
  5. Step 5: Solve for x
    x = 352,888,098.88/21,387.42
  6. Step 6: Final answer
    x = 16,499.80

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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.