Home / 20,580.95-28,401.90-11,149.71

Finding the Fourth Proportional to 20,580.95, 28,401.90 and 11,149.71

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Solution

The fourth proportional to 20,580.95, 28,401.90 and 11,149.71 is: 15,386.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.95 : 28,401.90 = 11,149.71 : x
  2. Step 2: Convert to fraction form
    20,580.95/28,401.90 = 11,149.71/x
  3. Step 3: Cross multiply
    20,580.95x = 28,401.90 × 11,149.71
  4. Step 4: Simplify right side
    20,580.95x = 316,672,948.45
  5. Step 5: Solve for x
    x = 316,672,948.45/20,580.95
  6. Step 6: Final answer
    x = 15,386.71

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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.