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Finding the Fourth Proportional to 691,221, 1,036,831.50 and 165,909

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Solution

The fourth proportional to 691,221, 1,036,831.50 and 165,909 is: 248,863.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,221 : 1,036,831.50 = 165,909 : x
  2. Step 2: Convert to fraction form
    691,221/1,036,831.50 = 165,909/x
  3. Step 3: Cross multiply
    691,221x = 1,036,831.50 × 165,909
  4. Step 4: Simplify right side
    691,221x = 172,019,677,333.50
  5. Step 5: Solve for x
    x = 172,019,677,333.50/691,221
  6. Step 6: Final answer
    x = 248,863.50

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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.