Home / 15,321.80-21,149.16-9,657.20

Finding the Fourth Proportional to 15,321.80, 21,149.16 and 9,657.20

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Solution

The fourth proportional to 15,321.80, 21,149.16 and 9,657.20 is: 13,330.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.80 : 21,149.16 = 9,657.20 : x
  2. Step 2: Convert to fraction form
    15,321.80/21,149.16 = 9,657.20/x
  3. Step 3: Cross multiply
    15,321.80x = 21,149.16 × 9,657.20
  4. Step 4: Simplify right side
    15,321.80x = 204,241,667.95
  5. Step 5: Solve for x
    x = 204,241,667.95/15,321.80
  6. Step 6: Final answer
    x = 13,330.14

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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.