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Finding the Fourth Proportional to 420,433.61, 630,686.86 and 120,938.54

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Solution

The fourth proportional to 420,433.61, 630,686.86 and 120,938.54 is: 181,418.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,433.61 : 630,686.86 = 120,938.54 : x
  2. Step 2: Convert to fraction form
    420,433.61/630,686.86 = 120,938.54/x
  3. Step 3: Cross multiply
    420,433.61x = 630,686.86 × 120,938.54
  4. Step 4: Simplify right side
    420,433.61x = 76,274,344,589.80
  5. Step 5: Solve for x
    x = 76,274,344,589.80/420,433.61
  6. Step 6: Final answer
    x = 181,418.29

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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.