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Finding the Fourth Proportional to 619.74, 928.57 and 436.81

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Solution

The fourth proportional to 619.74, 928.57 and 436.81 is: 654.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.74 : 928.57 = 436.81 : x
  2. Step 2: Convert to fraction form
    619.74/928.57 = 436.81/x
  3. Step 3: Cross multiply
    619.74x = 928.57 × 436.81
  4. Step 4: Simplify right side
    619.74x = 405,608.66
  5. Step 5: Solve for x
    x = 405,608.66/619.74
  6. Step 6: Final answer
    x = 654.48

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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.