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Finding the Fourth Proportional to 491.44, 678.28 and 292.31

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Solution

The fourth proportional to 491.44, 678.28 and 292.31 is: 403.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.44 : 678.28 = 292.31 : x
  2. Step 2: Convert to fraction form
    491.44/678.28 = 292.31/x
  3. Step 3: Cross multiply
    491.44x = 678.28 × 292.31
  4. Step 4: Simplify right side
    491.44x = 198,268.99
  5. Step 5: Solve for x
    x = 198,268.99/491.44
  6. Step 6: Final answer
    x = 403.45

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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.