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Finding the Fourth Proportional to 680,535.40, 939,129.62 and 378,729.40

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Solution

The fourth proportional to 680,535.40, 939,129.62 and 378,729.40 is: 522,641.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,535.40 : 939,129.62 = 378,729.40 : x
  2. Step 2: Convert to fraction form
    680,535.40/939,129.62 = 378,729.40/x
  3. Step 3: Cross multiply
    680,535.40x = 939,129.62 × 378,729.40
  4. Step 4: Simplify right side
    680,535.40x = 355,675,997,504.83
  5. Step 5: Solve for x
    x = 355,675,997,504.83/680,535.40
  6. Step 6: Final answer
    x = 522,641.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.