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Finding the Fourth Proportional to 420,116.40, 630,635.40 and 262,522.80

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Solution

The fourth proportional to 420,116.40, 630,635.40 and 262,522.80 is: 394,072.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,116.40 : 630,635.40 = 262,522.80 : x
  2. Step 2: Convert to fraction form
    420,116.40/630,635.40 = 262,522.80/x
  3. Step 3: Cross multiply
    420,116.40x = 630,635.40 × 262,522.80
  4. Step 4: Simplify right side
    420,116.40x = 165,556,170,987.12
  5. Step 5: Solve for x
    x = 165,556,170,987.12/420,116.40
  6. Step 6: Final answer
    x = 394,072.15

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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.