Home / 15,385.16-21,231.53-8,311.58

Finding the Fourth Proportional to 15,385.16, 21,231.53 and 8,311.58

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Solution

The fourth proportional to 15,385.16, 21,231.53 and 8,311.58 is: 11,469.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.16 : 21,231.53 = 8,311.58 : x
  2. Step 2: Convert to fraction form
    15,385.16/21,231.53 = 8,311.58/x
  3. Step 3: Cross multiply
    15,385.16x = 21,231.53 × 8,311.58
  4. Step 4: Simplify right side
    15,385.16x = 176,467,560.12
  5. Step 5: Solve for x
    x = 176,467,560.12/15,385.16
  6. Step 6: Final answer
    x = 11,469.99

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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.