Home / 20,979.61-28,951.43-11,419.34

Finding the Fourth Proportional to 20,979.61, 28,951.43 and 11,419.34

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Solution

The fourth proportional to 20,979.61, 28,951.43 and 11,419.34 is: 15,758.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.61 : 28,951.43 = 11,419.34 : x
  2. Step 2: Convert to fraction form
    20,979.61/28,951.43 = 11,419.34/x
  3. Step 3: Cross multiply
    20,979.61x = 28,951.43 × 11,419.34
  4. Step 4: Simplify right side
    20,979.61x = 330,606,020.80
  5. Step 5: Solve for x
    x = 330,606,020.80/20,979.61
  6. Step 6: Final answer
    x = 15,758.45

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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.