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Finding the Fourth Proportional to 665.18, 918.06 and 403.36

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Solution

The fourth proportional to 665.18, 918.06 and 403.36 is: 556.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.18 : 918.06 = 403.36 : x
  2. Step 2: Convert to fraction form
    665.18/918.06 = 403.36/x
  3. Step 3: Cross multiply
    665.18x = 918.06 × 403.36
  4. Step 4: Simplify right side
    665.18x = 370,308.68
  5. Step 5: Solve for x
    x = 370,308.68/665.18
  6. Step 6: Final answer
    x = 556.70

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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.