Home / 115,140.20-172,418.70-91,812.20

Finding the Fourth Proportional to 115,140.20, 172,418.70 and 91,812.20

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Solution

The fourth proportional to 115,140.20, 172,418.70 and 91,812.20 is: 137,485.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,140.20 : 172,418.70 = 91,812.20 : x
  2. Step 2: Convert to fraction form
    115,140.20/172,418.70 = 91,812.20/x
  3. Step 3: Cross multiply
    115,140.20x = 172,418.70 × 91,812.20
  4. Step 4: Simplify right side
    115,140.20x = 15,830,140,168.14
  5. Step 5: Solve for x
    x = 15,830,140,168.14/115,140.20
  6. Step 6: Final answer
    x = 137,485.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.