Home / 13,710.20-18,920.15-7,422.57

Finding the Fourth Proportional to 13,710.20, 18,920.15 and 7,422.57

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Solution

The fourth proportional to 13,710.20, 18,920.15 and 7,422.57 is: 10,243.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.20 : 18,920.15 = 7,422.57 : x
  2. Step 2: Convert to fraction form
    13,710.20/18,920.15 = 7,422.57/x
  3. Step 3: Cross multiply
    13,710.20x = 18,920.15 × 7,422.57
  4. Step 4: Simplify right side
    13,710.20x = 140,436,128.51
  5. Step 5: Solve for x
    x = 140,436,128.51/13,710.20
  6. Step 6: Final answer
    x = 10,243.19

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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.