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Finding the Fourth Proportional to 372,431.80, 558,647.70 and 135,782.20

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Solution

The fourth proportional to 372,431.80, 558,647.70 and 135,782.20 is: 203,673.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    372,431.80 : 558,647.70 = 135,782.20 : x
  2. Step 2: Convert to fraction form
    372,431.80/558,647.70 = 135,782.20/x
  3. Step 3: Cross multiply
    372,431.80x = 558,647.70 × 135,782.20
  4. Step 4: Simplify right side
    372,431.80x = 75,854,413,730.94
  5. Step 5: Solve for x
    x = 75,854,413,730.94/372,431.80
  6. Step 6: Final answer
    x = 203,673.30

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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.