Home / 20,938.78-28,895.61-11,507.95

Finding the Fourth Proportional to 20,938.78, 28,895.61 and 11,507.95

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Solution

The fourth proportional to 20,938.78, 28,895.61 and 11,507.95 is: 15,881.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.78 : 28,895.61 = 11,507.95 : x
  2. Step 2: Convert to fraction form
    20,938.78/28,895.61 = 11,507.95/x
  3. Step 3: Cross multiply
    20,938.78x = 28,895.61 × 11,507.95
  4. Step 4: Simplify right side
    20,938.78x = 332,529,235.10
  5. Step 5: Solve for x
    x = 332,529,235.10/20,938.78
  6. Step 6: Final answer
    x = 15,881.02

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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.