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Finding the Fourth Proportional to 207,909.30, 311,426.55 and 172,917.30

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Solution

The fourth proportional to 207,909.30, 311,426.55 and 172,917.30 is: 259,012.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,909.30 : 311,426.55 = 172,917.30 : x
  2. Step 2: Convert to fraction form
    207,909.30/311,426.55 = 172,917.30/x
  3. Step 3: Cross multiply
    207,909.30x = 311,426.55 × 172,917.30
  4. Step 4: Simplify right side
    207,909.30x = 53,851,038,174.32
  5. Step 5: Solve for x
    x = 53,851,038,174.32/207,909.30
  6. Step 6: Final answer
    x = 259,012.17

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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.