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Finding the Fourth Proportional to 664,603.20, 917,140.52 and 378,117.12

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Solution

The fourth proportional to 664,603.20, 917,140.52 and 378,117.12 is: 521,794.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,603.20 : 917,140.52 = 378,117.12 : x
  2. Step 2: Convert to fraction form
    664,603.20/917,140.52 = 378,117.12/x
  3. Step 3: Cross multiply
    664,603.20x = 917,140.52 × 378,117.12
  4. Step 4: Simplify right side
    664,603.20x = 346,786,532,057.70
  5. Step 5: Solve for x
    x = 346,786,532,057.70/664,603.20
  6. Step 6: Final answer
    x = 521,794.86

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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.