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Finding the Fourth Proportional to 642,355.56, 886,412.34 and 355,854.96

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Solution

The fourth proportional to 642,355.56, 886,412.34 and 355,854.96 is: 491,058.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,355.56 : 886,412.34 = 355,854.96 : x
  2. Step 2: Convert to fraction form
    642,355.56/886,412.34 = 355,854.96/x
  3. Step 3: Cross multiply
    642,355.56x = 886,412.34 × 355,854.96
  4. Step 4: Simplify right side
    642,355.56x = 315,434,227,794.21
  5. Step 5: Solve for x
    x = 315,434,227,794.21/642,355.56
  6. Step 6: Final answer
    x = 491,058.61

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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.