Home / 15,385.11-21,231.43-8,311.51

Finding the Fourth Proportional to 15,385.11, 21,231.43 and 8,311.51

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Solution

The fourth proportional to 15,385.11, 21,231.43 and 8,311.51 is: 11,469.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.11 : 21,231.43 = 8,311.51 : x
  2. Step 2: Convert to fraction form
    15,385.11/21,231.43 = 8,311.51/x
  3. Step 3: Cross multiply
    15,385.11x = 21,231.43 × 8,311.51
  4. Step 4: Simplify right side
    15,385.11x = 176,465,242.76
  5. Step 5: Solve for x
    x = 176,465,242.76/15,385.11
  6. Step 6: Final answer
    x = 11,469.87

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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.