Home / 15,391.78-21,240.67-8,318.21

Finding the Fourth Proportional to 15,391.78, 21,240.67 and 8,318.21

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Solution

The fourth proportional to 15,391.78, 21,240.67 and 8,318.21 is: 11,479.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,391.78 : 21,240.67 = 8,318.21 : x
  2. Step 2: Convert to fraction form
    15,391.78/21,240.67 = 8,318.21/x
  3. Step 3: Cross multiply
    15,391.78x = 21,240.67 × 8,318.21
  4. Step 4: Simplify right side
    15,391.78x = 176,684,226.60
  5. Step 5: Solve for x
    x = 176,684,226.60/15,391.78
  6. Step 6: Final answer
    x = 11,479.13

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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.