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Finding the Fourth Proportional to 665.71, 918.43 and 403.63

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Solution

The fourth proportional to 665.71, 918.43 and 403.63 is: 556.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.71 : 918.43 = 403.63 : x
  2. Step 2: Convert to fraction form
    665.71/918.43 = 403.63/x
  3. Step 3: Cross multiply
    665.71x = 918.43 × 403.63
  4. Step 4: Simplify right side
    665.71x = 370,705.90
  5. Step 5: Solve for x
    x = 370,705.90/665.71
  6. Step 6: Final answer
    x = 556.86

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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.