Home / 687,221.28-1,031,007.42-213,910.20

Finding the Fourth Proportional to 687,221.28, 1,031,007.42 and 213,910.20

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Solution

The fourth proportional to 687,221.28, 1,031,007.42 and 213,910.20 is: 320,919.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,221.28 : 1,031,007.42 = 213,910.20 : x
  2. Step 2: Convert to fraction form
    687,221.28/1,031,007.42 = 213,910.20/x
  3. Step 3: Cross multiply
    687,221.28x = 1,031,007.42 × 213,910.20
  4. Step 4: Simplify right side
    687,221.28x = 220,543,003,413.68
  5. Step 5: Solve for x
    x = 220,543,003,413.68/687,221.28
  6. Step 6: Final answer
    x = 320,919.93

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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.