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Finding the Fourth Proportional to 115,057.80, 172,389.60 and 91,438.20

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Solution

The fourth proportional to 115,057.80, 172,389.60 and 91,438.20 is: 137,000.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,057.80 : 172,389.60 = 91,438.20 : x
  2. Step 2: Convert to fraction form
    115,057.80/172,389.60 = 91,438.20/x
  3. Step 3: Cross multiply
    115,057.80x = 172,389.60 × 91,438.20
  4. Step 4: Simplify right side
    115,057.80x = 15,762,994,722.72
  5. Step 5: Solve for x
    x = 15,762,994,722.72/115,057.80
  6. Step 6: Final answer
    x = 137,000.66

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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.