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Finding the Fourth Proportional to 643.27, 965.08 and 278.32

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Solution

The fourth proportional to 643.27, 965.08 and 278.32 is: 417.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.27 : 965.08 = 278.32 : x
  2. Step 2: Convert to fraction form
    643.27/965.08 = 278.32/x
  3. Step 3: Cross multiply
    643.27x = 965.08 × 278.32
  4. Step 4: Simplify right side
    643.27x = 268,598.65
  5. Step 5: Solve for x
    x = 268,598.65/643.27
  6. Step 6: Final answer
    x = 417.55

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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.