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Finding the Fourth Proportional to 642,350.55, 886,408.85 and 355,853.55

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Solution

The fourth proportional to 642,350.55, 886,408.85 and 355,853.55 is: 491,058.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,350.55 : 886,408.85 = 355,853.55 : x
  2. Step 2: Convert to fraction form
    642,350.55/886,408.85 = 355,853.55/x
  3. Step 3: Cross multiply
    642,350.55x = 886,408.85 × 355,853.55
  4. Step 4: Simplify right side
    642,350.55x = 315,431,740,237.59
  5. Step 5: Solve for x
    x = 315,431,740,237.59/642,350.55
  6. Step 6: Final answer
    x = 491,058.56

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1.5x scale

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.