Home / 21,013.55-28,998.92-12,515.78

Finding the Fourth Proportional to 21,013.55, 28,998.92 and 12,515.78

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Solution

The fourth proportional to 21,013.55, 28,998.92 and 12,515.78 is: 17,271.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.55 : 28,998.92 = 12,515.78 : x
  2. Step 2: Convert to fraction form
    21,013.55/28,998.92 = 12,515.78/x
  3. Step 3: Cross multiply
    21,013.55x = 28,998.92 × 12,515.78
  4. Step 4: Simplify right side
    21,013.55x = 362,944,136.34
  5. Step 5: Solve for x
    x = 362,944,136.34/21,013.55
  6. Step 6: Final answer
    x = 17,271.91

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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.