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Finding the Fourth Proportional to 663,958.92, 916,334.28 and 405,987.06

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Solution

The fourth proportional to 663,958.92, 916,334.28 and 405,987.06 is: 560,305.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,958.92 : 916,334.28 = 405,987.06 : x
  2. Step 2: Convert to fraction form
    663,958.92/916,334.28 = 405,987.06/x
  3. Step 3: Cross multiply
    663,958.92x = 916,334.28 × 405,987.06
  4. Step 4: Simplify right side
    663,958.92x = 372,019,860,314.42
  5. Step 5: Solve for x
    x = 372,019,860,314.42/663,958.92
  6. Step 6: Final answer
    x = 560,305.54

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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.