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Finding the Fourth Proportional to 643.59, 965.66 and 412.74

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Solution

The fourth proportional to 643.59, 965.66 and 412.74 is: 619.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.59 : 965.66 = 412.74 : x
  2. Step 2: Convert to fraction form
    643.59/965.66 = 412.74/x
  3. Step 3: Cross multiply
    643.59x = 965.66 × 412.74
  4. Step 4: Simplify right side
    643.59x = 398,566.51
  5. Step 5: Solve for x
    x = 398,566.51/643.59
  6. Step 6: Final answer
    x = 619.29

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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.