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Finding the Fourth Proportional to 627,409.13, 865,754.33 and 355,418.78

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Solution

The fourth proportional to 627,409.13, 865,754.33 and 355,418.78 is: 490,438.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,409.13 : 865,754.33 = 355,418.78 : x
  2. Step 2: Convert to fraction form
    627,409.13/865,754.33 = 355,418.78/x
  3. Step 3: Cross multiply
    627,409.13x = 865,754.33 × 355,418.78
  4. Step 4: Simplify right side
    627,409.13x = 307,705,341,642.45
  5. Step 5: Solve for x
    x = 307,705,341,642.45/627,409.13
  6. Step 6: Final answer
    x = 490,438.10

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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.