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Finding the Fourth Proportional to 665.35, 918.34 and 403.31

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Solution

The fourth proportional to 665.35, 918.34 and 403.31 is: 556.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.35 : 918.34 = 403.31 : x
  2. Step 2: Convert to fraction form
    665.35/918.34 = 403.31/x
  3. Step 3: Cross multiply
    665.35x = 918.34 × 403.31
  4. Step 4: Simplify right side
    665.35x = 370,376.99
  5. Step 5: Solve for x
    x = 370,376.99/665.35
  6. Step 6: Final answer
    x = 556.67

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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.