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Finding the Fourth Proportional to 643.48, 965.06 and 540.84

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Solution

The fourth proportional to 643.48, 965.06 and 540.84 is: 811.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.48 : 965.06 = 540.84 : x
  2. Step 2: Convert to fraction form
    643.48/965.06 = 540.84/x
  3. Step 3: Cross multiply
    643.48x = 965.06 × 540.84
  4. Step 4: Simplify right side
    643.48x = 521,943.05
  5. Step 5: Solve for x
    x = 521,943.05/643.48
  6. Step 6: Final answer
    x = 811.13

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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.