Home / 13,565.57-18,720.05-7,515.56

Finding the Fourth Proportional to 13,565.57, 18,720.05 and 7,515.56

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Solution

The fourth proportional to 13,565.57, 18,720.05 and 7,515.56 is: 10,371.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,565.57 : 18,720.05 = 7,515.56 : x
  2. Step 2: Convert to fraction form
    13,565.57/18,720.05 = 7,515.56/x
  3. Step 3: Cross multiply
    13,565.57x = 18,720.05 × 7,515.56
  4. Step 4: Simplify right side
    13,565.57x = 140,691,621.40
  5. Step 5: Solve for x
    x = 140,691,621.40/13,565.57
  6. Step 6: Final answer
    x = 10,371.23

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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.