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Finding the Fourth Proportional to 699.72, 965.62 and 405.04

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Solution

The fourth proportional to 699.72, 965.62 and 405.04 is: 558.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.72 : 965.62 = 405.04 : x
  2. Step 2: Convert to fraction form
    699.72/965.62 = 405.04/x
  3. Step 3: Cross multiply
    699.72x = 965.62 × 405.04
  4. Step 4: Simplify right side
    699.72x = 391,114.72
  5. Step 5: Solve for x
    x = 391,114.72/699.72
  6. Step 6: Final answer
    x = 558.96

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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.