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Finding the Fourth Proportional to 627,311.45, 865,661.59 and 355,373.80

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Solution

The fourth proportional to 627,311.45, 865,661.59 and 355,373.80 is: 490,399.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    627,311.45 : 865,661.59 = 355,373.80 : x
  2. Step 2: Convert to fraction form
    627,311.45/865,661.59 = 355,373.80/x
  3. Step 3: Cross multiply
    627,311.45x = 865,661.59 × 355,373.80
  4. Step 4: Simplify right side
    627,311.45x = 307,633,448,752.34
  5. Step 5: Solve for x
    x = 307,633,448,752.34/627,311.45
  6. Step 6: Final answer
    x = 490,399.86

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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.