Home / 20,955.11-28,916.60-12,456.79

Finding the Fourth Proportional to 20,955.11, 28,916.60 and 12,456.79

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Solution

The fourth proportional to 20,955.11, 28,916.60 and 12,456.79 is: 17,189.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,955.11 : 28,916.60 = 12,456.79 : x
  2. Step 2: Convert to fraction form
    20,955.11/28,916.60 = 12,456.79/x
  3. Step 3: Cross multiply
    20,955.11x = 28,916.60 × 12,456.79
  4. Step 4: Simplify right side
    20,955.11x = 360,207,879.14
  5. Step 5: Solve for x
    x = 360,207,879.14/20,955.11
  6. Step 6: Final answer
    x = 17,189.50

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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.