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Finding the Fourth Proportional to 643,722.12, 888,320.82 and 357,237.96

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Solution

The fourth proportional to 643,722.12, 888,320.82 and 357,237.96 is: 492,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,722.12 : 888,320.82 = 357,237.96 : x
  2. Step 2: Convert to fraction form
    643,722.12/888,320.82 = 357,237.96/x
  3. Step 3: Cross multiply
    643,722.12x = 888,320.82 × 357,237.96
  4. Step 4: Simplify right side
    643,722.12x = 317,341,917,562.33
  5. Step 5: Solve for x
    x = 317,341,917,562.33/643,722.12
  6. Step 6: Final answer
    x = 492,979.67

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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.