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Finding the Fourth Proportional to 643.35, 965.13 and 400.14

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Solution

The fourth proportional to 643.35, 965.13 and 400.14 is: 600.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.35 : 965.13 = 400.14 : x
  2. Step 2: Convert to fraction form
    643.35/965.13 = 400.14/x
  3. Step 3: Cross multiply
    643.35x = 965.13 × 400.14
  4. Step 4: Simplify right side
    643.35x = 386,187.12
  5. Step 5: Solve for x
    x = 386,187.12/643.35
  6. Step 6: Final answer
    x = 600.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.