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Finding the Fourth Proportional to 420,608.01, 630,817.68 and 121,021.83

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Solution

The fourth proportional to 420,608.01, 630,817.68 and 121,021.83 is: 181,505.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,608.01 : 630,817.68 = 121,021.83 : x
  2. Step 2: Convert to fraction form
    420,608.01/630,817.68 = 121,021.83/x
  3. Step 3: Cross multiply
    420,608.01x = 630,817.68 × 121,021.83
  4. Step 4: Simplify right side
    420,608.01x = 76,342,710,029.95
  5. Step 5: Solve for x
    x = 76,342,710,029.95/420,608.01
  6. Step 6: Final answer
    x = 181,505.60

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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.