Home / 21,136.71-29,176.90-12,191.88

Finding the Fourth Proportional to 21,136.71, 29,176.90 and 12,191.88

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Solution

The fourth proportional to 21,136.71, 29,176.90 and 12,191.88 is: 16,829.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.71 : 29,176.90 = 12,191.88 : x
  2. Step 2: Convert to fraction form
    21,136.71/29,176.90 = 12,191.88/x
  3. Step 3: Cross multiply
    21,136.71x = 29,176.90 × 12,191.88
  4. Step 4: Simplify right side
    21,136.71x = 355,721,263.57
  5. Step 5: Solve for x
    x = 355,721,263.57/21,136.71
  6. Step 6: Final answer
    x = 16,829.55

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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.