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Finding the Fourth Proportional to 699.59, 965.44 and 400.90

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Solution

The fourth proportional to 699.59, 965.44 and 400.90 is: 553.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.59 : 965.44 = 400.90 : x
  2. Step 2: Convert to fraction form
    699.59/965.44 = 400.90/x
  3. Step 3: Cross multiply
    699.59x = 965.44 × 400.90
  4. Step 4: Simplify right side
    699.59x = 387,044.90
  5. Step 5: Solve for x
    x = 387,044.90/699.59
  6. Step 6: Final answer
    x = 553.25

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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.