Home / 20,344.10-28,072.40-11,390.90

Finding the Fourth Proportional to 20,344.10, 28,072.40 and 11,390.90

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Solution

The fourth proportional to 20,344.10, 28,072.40 and 11,390.90 is: 15,718.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,344.10 : 28,072.40 = 11,390.90 : x
  2. Step 2: Convert to fraction form
    20,344.10/28,072.40 = 11,390.90/x
  3. Step 3: Cross multiply
    20,344.10x = 28,072.40 × 11,390.90
  4. Step 4: Simplify right side
    20,344.10x = 319,769,901.16
  5. Step 5: Solve for x
    x = 319,769,901.16/20,344.10
  6. Step 6: Final answer
    x = 15,718.07

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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.