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Finding the Fourth Proportional to 663,494.82, 915,334.11 and 421,647.72

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Solution

The fourth proportional to 663,494.82, 915,334.11 and 421,647.72 is: 581,690.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,494.82 : 915,334.11 = 421,647.72 : x
  2. Step 2: Convert to fraction form
    663,494.82/915,334.11 = 421,647.72/x
  3. Step 3: Cross multiply
    663,494.82x = 915,334.11 × 421,647.72
  4. Step 4: Simplify right side
    663,494.82x = 385,948,540,519.73
  5. Step 5: Solve for x
    x = 385,948,540,519.73/663,494.82
  6. Step 6: Final answer
    x = 581,690.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.