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Finding the Fourth Proportional to 643,918.82, 888,563.51 and 357,416.34

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Solution

The fourth proportional to 643,918.82, 888,563.51 and 357,416.34 is: 493,209.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,918.82 : 888,563.51 = 357,416.34 : x
  2. Step 2: Convert to fraction form
    643,918.82/888,563.51 = 357,416.34/x
  3. Step 3: Cross multiply
    643,918.82x = 888,563.51 × 357,416.34
  4. Step 4: Simplify right side
    643,918.82x = 317,587,115,814.67
  5. Step 5: Solve for x
    x = 317,587,115,814.67/643,918.82
  6. Step 6: Final answer
    x = 493,209.87

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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.