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Finding the Fourth Proportional to 717.36, 989.96 and 398.32

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Solution

The fourth proportional to 717.36, 989.96 and 398.32 is: 549.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.36 : 989.96 = 398.32 : x
  2. Step 2: Convert to fraction form
    717.36/989.96 = 398.32/x
  3. Step 3: Cross multiply
    717.36x = 989.96 × 398.32
  4. Step 4: Simplify right side
    717.36x = 394,317.65
  5. Step 5: Solve for x
    x = 394,317.65/717.36
  6. Step 6: Final answer
    x = 549.68

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1.5x scale

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.