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Finding the Fourth Proportional to 717.86, 990.63 and 455.63

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Solution

The fourth proportional to 717.86, 990.63 and 455.63 is: 628.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.86 : 990.63 = 455.63 : x
  2. Step 2: Convert to fraction form
    717.86/990.63 = 455.63/x
  3. Step 3: Cross multiply
    717.86x = 990.63 × 455.63
  4. Step 4: Simplify right side
    717.86x = 451,355.79
  5. Step 5: Solve for x
    x = 451,355.79/717.86
  6. Step 6: Final answer
    x = 628.75

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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.