Home / 15,387.78-21,235.13-8,314.20

Finding the Fourth Proportional to 15,387.78, 21,235.13 and 8,314.20

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Solution

The fourth proportional to 15,387.78, 21,235.13 and 8,314.20 is: 11,473.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,387.78 : 21,235.13 = 8,314.20 : x
  2. Step 2: Convert to fraction form
    15,387.78/21,235.13 = 8,314.20/x
  3. Step 3: Cross multiply
    15,387.78x = 21,235.13 × 8,314.20
  4. Step 4: Simplify right side
    15,387.78x = 176,553,107.45
  5. Step 5: Solve for x
    x = 176,553,107.45/15,387.78
  6. Step 6: Final answer
    x = 11,473.59

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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.