Home / 20,580.78-28,401.45-11,149.38

Finding the Fourth Proportional to 20,580.78, 28,401.45 and 11,149.38

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Solution

The fourth proportional to 20,580.78, 28,401.45 and 11,149.38 is: 15,386.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.78 : 28,401.45 = 11,149.38 : x
  2. Step 2: Convert to fraction form
    20,580.78/28,401.45 = 11,149.38/x
  3. Step 3: Cross multiply
    20,580.78x = 28,401.45 × 11,149.38
  4. Step 4: Simplify right side
    20,580.78x = 316,658,558.60
  5. Step 5: Solve for x
    x = 316,658,558.60/20,580.78
  6. Step 6: Final answer
    x = 15,386.13

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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.