Home / 15,508.78-21,401.52-8,435.21

Finding the Fourth Proportional to 15,508.78, 21,401.52 and 8,435.21

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Solution

The fourth proportional to 15,508.78, 21,401.52 and 8,435.21 is: 11,640.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,508.78 : 21,401.52 = 8,435.21 : x
  2. Step 2: Convert to fraction form
    15,508.78/21,401.52 = 8,435.21/x
  3. Step 3: Cross multiply
    15,508.78x = 21,401.52 × 8,435.21
  4. Step 4: Simplify right side
    15,508.78x = 180,526,315.52
  5. Step 5: Solve for x
    x = 180,526,315.52/15,508.78
  6. Step 6: Final answer
    x = 11,640.27

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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.