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Finding the Fourth Proportional to 665.08, 918.18 and 403.18

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Solution

The fourth proportional to 665.08, 918.18 and 403.18 is: 556.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.08 : 918.18 = 403.18 : x
  2. Step 2: Convert to fraction form
    665.08/918.18 = 403.18/x
  3. Step 3: Cross multiply
    665.08x = 918.18 × 403.18
  4. Step 4: Simplify right side
    665.08x = 370,191.81
  5. Step 5: Solve for x
    x = 370,191.81/665.08
  6. Step 6: Final answer
    x = 556.61

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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.