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Finding the Fourth Proportional to 635.92, 947.06 and 618.64

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Solution

The fourth proportional to 635.92, 947.06 and 618.64 is: 921.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.92 : 947.06 = 618.64 : x
  2. Step 2: Convert to fraction form
    635.92/947.06 = 618.64/x
  3. Step 3: Cross multiply
    635.92x = 947.06 × 618.64
  4. Step 4: Simplify right side
    635.92x = 585,889.20
  5. Step 5: Solve for x
    x = 585,889.20/635.92
  6. Step 6: Final answer
    x = 921.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.