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Finding the Fourth Proportional to 717.78, 990.25 and 438.00

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Solution

The fourth proportional to 717.78, 990.25 and 438.00 is: 604.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.78 : 990.25 = 438.00 : x
  2. Step 2: Convert to fraction form
    717.78/990.25 = 438.00/x
  3. Step 3: Cross multiply
    717.78x = 990.25 × 438.00
  4. Step 4: Simplify right side
    717.78x = 433,726.33
  5. Step 5: Solve for x
    x = 433,726.33/717.78
  6. Step 6: Final answer
    x = 604.26

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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.