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Finding the Fourth Proportional to 717.53, 988.00 and 644.63

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Solution

The fourth proportional to 717.53, 988.00 and 644.63 is: 887.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.53 : 988.00 = 644.63 : x
  2. Step 2: Convert to fraction form
    717.53/988.00 = 644.63/x
  3. Step 3: Cross multiply
    717.53x = 988.00 × 644.63
  4. Step 4: Simplify right side
    717.53x = 636,887.89
  5. Step 5: Solve for x
    x = 636,887.89/717.53
  6. Step 6: Final answer
    x = 887.62

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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.