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Finding the Fourth Proportional to 816,859.90, 1,225,128.33 and 776,352.87

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Solution

The fourth proportional to 816,859.90, 1,225,128.33 and 776,352.87 is: 1,164,375.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    816,859.90 : 1,225,128.33 = 776,352.87 : x
  2. Step 2: Convert to fraction form
    816,859.90/1,225,128.33 = 776,352.87/x
  3. Step 3: Cross multiply
    816,859.90x = 1,225,128.33 × 776,352.87
  4. Step 4: Simplify right side
    816,859.90x = 951,131,888,988.17
  5. Step 5: Solve for x
    x = 951,131,888,988.17/816,859.90
  6. Step 6: Final answer
    x = 1,164,375.78

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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.