Home / 21,747.30-30,011.13-12,315.90

Finding the Fourth Proportional to 21,747.30, 30,011.13 and 12,315.90

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Solution

The fourth proportional to 21,747.30, 30,011.13 and 12,315.90 is: 16,995.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,747.30 : 30,011.13 = 12,315.90 : x
  2. Step 2: Convert to fraction form
    21,747.30/30,011.13 = 12,315.90/x
  3. Step 3: Cross multiply
    21,747.30x = 30,011.13 × 12,315.90
  4. Step 4: Simplify right side
    21,747.30x = 369,614,075.97
  5. Step 5: Solve for x
    x = 369,614,075.97/21,747.30
  6. Step 6: Final answer
    x = 16,995.86

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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.