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Finding the Fourth Proportional to 643,603.56, 888,172.80 and 357,169.68

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Solution

The fourth proportional to 643,603.56, 888,172.80 and 357,169.68 is: 492,894.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,603.56 : 888,172.80 = 357,169.68 : x
  2. Step 2: Convert to fraction form
    643,603.56/888,172.80 = 357,169.68/x
  3. Step 3: Cross multiply
    643,603.56x = 888,172.80 × 357,169.68
  4. Step 4: Simplify right side
    643,603.56x = 317,228,394,760.70
  5. Step 5: Solve for x
    x = 317,228,394,760.70/643,603.56
  6. Step 6: Final answer
    x = 492,894.10

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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.