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Finding the Fourth Proportional to 717.05, 989.47 and 402.32

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Solution

The fourth proportional to 717.05, 989.47 and 402.32 is: 555.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.05 : 989.47 = 402.32 : x
  2. Step 2: Convert to fraction form
    717.05/989.47 = 402.32/x
  3. Step 3: Cross multiply
    717.05x = 989.47 × 402.32
  4. Step 4: Simplify right side
    717.05x = 398,078.72
  5. Step 5: Solve for x
    x = 398,078.72/717.05
  6. Step 6: Final answer
    x = 555.16

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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.