Home / 15,399.90-21,234.78-11,142.54

Finding the Fourth Proportional to 15,399.90, 21,234.78 and 11,142.54

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Solution

The fourth proportional to 15,399.90, 21,234.78 and 11,142.54 is: 15,364.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,399.90 : 21,234.78 = 11,142.54 : x
  2. Step 2: Convert to fraction form
    15,399.90/21,234.78 = 11,142.54/x
  3. Step 3: Cross multiply
    15,399.90x = 21,234.78 × 11,142.54
  4. Step 4: Simplify right side
    15,399.90x = 236,609,385.54
  5. Step 5: Solve for x
    x = 236,609,385.54/15,399.90
  6. Step 6: Final answer
    x = 15,364.35

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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.