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Finding the Fourth Proportional to 687,806.40, 1,031,855.40 and 207,994.80

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Solution

The fourth proportional to 687,806.40, 1,031,855.40 and 207,994.80 is: 312,036.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,806.40 : 1,031,855.40 = 207,994.80 : x
  2. Step 2: Convert to fraction form
    687,806.40/1,031,855.40 = 207,994.80/x
  3. Step 3: Cross multiply
    687,806.40x = 1,031,855.40 × 207,994.80
  4. Step 4: Simplify right side
    687,806.40x = 214,620,557,551.92
  5. Step 5: Solve for x
    x = 214,620,557,551.92/687,806.40
  6. Step 6: Final answer
    x = 312,036.29

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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.