Home / 20,979.81-28,948.89-13,432.84

Finding the Fourth Proportional to 20,979.81, 28,948.89 and 13,432.84

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Solution

The fourth proportional to 20,979.81, 28,948.89 and 13,432.84 is: 18,535.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.81 : 28,948.89 = 13,432.84 : x
  2. Step 2: Convert to fraction form
    20,979.81/28,948.89 = 13,432.84/x
  3. Step 3: Cross multiply
    20,979.81x = 28,948.89 × 13,432.84
  4. Step 4: Simplify right side
    20,979.81x = 388,865,785.55
  5. Step 5: Solve for x
    x = 388,865,785.55/20,979.81
  6. Step 6: Final answer
    x = 18,535.24

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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.