Home / 15,415.28-21,273-8,700.56

Finding the Fourth Proportional to 15,415.28, 21,273 and 8,700.56

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Solution

The fourth proportional to 15,415.28, 21,273 and 8,700.56 is: 12,006.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,415.28 : 21,273 = 8,700.56 : x
  2. Step 2: Convert to fraction form
    15,415.28/21,273 = 8,700.56/x
  3. Step 3: Cross multiply
    15,415.28x = 21,273 × 8,700.56
  4. Step 4: Simplify right side
    15,415.28x = 185,087,012.88
  5. Step 5: Solve for x
    x = 185,087,012.88/15,415.28
  6. Step 6: Final answer
    x = 12,006.72

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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.