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Finding the Fourth Proportional to 115,131.20, 172,405.20 and 91,803.20

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Solution

The fourth proportional to 115,131.20, 172,405.20 and 91,803.20 is: 137,472.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,131.20 : 172,405.20 = 91,803.20 : x
  2. Step 2: Convert to fraction form
    115,131.20/172,405.20 = 91,803.20/x
  3. Step 3: Cross multiply
    115,131.20x = 172,405.20 × 91,803.20
  4. Step 4: Simplify right side
    115,131.20x = 15,827,349,056.64
  5. Step 5: Solve for x
    x = 15,827,349,056.64/115,131.20
  6. Step 6: Final answer
    x = 137,472.28

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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.