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Finding the Fourth Proportional to 420,516.55, 630,871.42 and 120,999.61

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Solution

The fourth proportional to 420,516.55, 630,871.42 and 120,999.61 is: 181,527.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,516.55 : 630,871.42 = 120,999.61 : x
  2. Step 2: Convert to fraction form
    420,516.55/630,871.42 = 120,999.61/x
  3. Step 3: Cross multiply
    420,516.55x = 630,871.42 × 120,999.61
  4. Step 4: Simplify right side
    420,516.55x = 76,335,195,780.15
  5. Step 5: Solve for x
    x = 76,335,195,780.15/420,516.55
  6. Step 6: Final answer
    x = 181,527.21

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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.