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Finding the Fourth Proportional to 717.84, 990.36 and 648

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Solution

The fourth proportional to 717.84, 990.36 and 648 is: 894.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.84 : 990.36 = 648 : x
  2. Step 2: Convert to fraction form
    717.84/990.36 = 648/x
  3. Step 3: Cross multiply
    717.84x = 990.36 × 648
  4. Step 4: Simplify right side
    717.84x = 641,753.28
  5. Step 5: Solve for x
    x = 641,753.28/717.84
  6. Step 6: Final answer
    x = 894.01

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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.