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Finding the Fourth Proportional to 458,555.40, 687,249.90 and 221,387.40

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Solution

The fourth proportional to 458,555.40, 687,249.90 and 221,387.40 is: 331,799.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,555.40 : 687,249.90 = 221,387.40 : x
  2. Step 2: Convert to fraction form
    458,555.40/687,249.90 = 221,387.40/x
  3. Step 3: Cross multiply
    458,555.40x = 687,249.90 × 221,387.40
  4. Step 4: Simplify right side
    458,555.40x = 152,148,468,511.26
  5. Step 5: Solve for x
    x = 152,148,468,511.26/458,555.40
  6. Step 6: Final answer
    x = 331,799.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.