Home / 15,275.78-21,080.42-8,561.70

Finding the Fourth Proportional to 15,275.78, 21,080.42 and 8,561.70

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Solution

The fourth proportional to 15,275.78, 21,080.42 and 8,561.70 is: 11,815.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,275.78 : 21,080.42 = 8,561.70 : x
  2. Step 2: Convert to fraction form
    15,275.78/21,080.42 = 8,561.70/x
  3. Step 3: Cross multiply
    15,275.78x = 21,080.42 × 8,561.70
  4. Step 4: Simplify right side
    15,275.78x = 180,484,231.91
  5. Step 5: Solve for x
    x = 180,484,231.91/15,275.78
  6. Step 6: Final answer
    x = 11,815.06

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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.