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Finding the Fourth Proportional to 643,564.98, 888,119.82 and 357,087.11

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Solution

The fourth proportional to 643,564.98, 888,119.82 and 357,087.11 is: 492,780.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,564.98 : 888,119.82 = 357,087.11 : x
  2. Step 2: Convert to fraction form
    643,564.98/888,119.82 = 357,087.11/x
  3. Step 3: Cross multiply
    643,564.98x = 888,119.82 × 357,087.11
  4. Step 4: Simplify right side
    643,564.98x = 317,136,135,416.92
  5. Step 5: Solve for x
    x = 317,136,135,416.92/643,564.98
  6. Step 6: Final answer
    x = 492,780.29

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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.