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Finding the Fourth Proportional to 420,115.91, 630,170.63 and 104,570.69

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Solution

The fourth proportional to 420,115.91, 630,170.63 and 104,570.69 is: 156,855.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,115.91 : 630,170.63 = 104,570.69 : x
  2. Step 2: Convert to fraction form
    420,115.91/630,170.63 = 104,570.69/x
  3. Step 3: Cross multiply
    420,115.91x = 630,170.63 × 104,570.69
  4. Step 4: Simplify right side
    420,115.91x = 65,897,377,073.98
  5. Step 5: Solve for x
    x = 65,897,377,073.98/420,115.91
  6. Step 6: Final answer
    x = 156,855.23

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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.