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Finding the Fourth Proportional to 491.78, 679.29 and 427.46

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Solution

The fourth proportional to 491.78, 679.29 and 427.46 is: 590.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.78 : 679.29 = 427.46 : x
  2. Step 2: Convert to fraction form
    491.78/679.29 = 427.46/x
  3. Step 3: Cross multiply
    491.78x = 679.29 × 427.46
  4. Step 4: Simplify right side
    491.78x = 290,369.30
  5. Step 5: Solve for x
    x = 290,369.30/491.78
  6. Step 6: Final answer
    x = 590.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.