Home / 13,689.20-18,892.20-7,722.32

Finding the Fourth Proportional to 13,689.20, 18,892.20 and 7,722.32

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Solution

The fourth proportional to 13,689.20, 18,892.20 and 7,722.32 is: 10,657.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.20 : 18,892.20 = 7,722.32 : x
  2. Step 2: Convert to fraction form
    13,689.20/18,892.20 = 7,722.32/x
  3. Step 3: Cross multiply
    13,689.20x = 18,892.20 × 7,722.32
  4. Step 4: Simplify right side
    13,689.20x = 145,891,613.90
  5. Step 5: Solve for x
    x = 145,891,613.90/13,689.20
  6. Step 6: Final answer
    x = 10,657.42

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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.