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Finding the Fourth Proportional to 717.79, 990.43 and 619.33

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Solution

The fourth proportional to 717.79, 990.43 and 619.33 is: 854.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.79 : 990.43 = 619.33 : x
  2. Step 2: Convert to fraction form
    717.79/990.43 = 619.33/x
  3. Step 3: Cross multiply
    717.79x = 990.43 × 619.33
  4. Step 4: Simplify right side
    717.79x = 613,403.01
  5. Step 5: Solve for x
    x = 613,403.01/717.79
  6. Step 6: Final answer
    x = 854.57

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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.