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Finding the Fourth Proportional to 461.19, 691.79 and 278.36

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Solution

The fourth proportional to 461.19, 691.79 and 278.36 is: 417.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.19 : 691.79 = 278.36 : x
  2. Step 2: Convert to fraction form
    461.19/691.79 = 278.36/x
  3. Step 3: Cross multiply
    461.19x = 691.79 × 278.36
  4. Step 4: Simplify right side
    461.19x = 192,566.66
  5. Step 5: Solve for x
    x = 192,566.66/461.19
  6. Step 6: Final answer
    x = 417.54

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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.