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Finding the Fourth Proportional to 717.06, 994.58 and 687.90

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Solution

The fourth proportional to 717.06, 994.58 and 687.90 is: 954.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.06 : 994.58 = 687.90 : x
  2. Step 2: Convert to fraction form
    717.06/994.58 = 687.90/x
  3. Step 3: Cross multiply
    717.06x = 994.58 × 687.90
  4. Step 4: Simplify right side
    717.06x = 684,168.14
  5. Step 5: Solve for x
    x = 684,168.14/717.06
  6. Step 6: Final answer
    x = 954.13

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.