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Finding the Fourth Proportional to 491.31, 677.84 and 314.24

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Solution

The fourth proportional to 491.31, 677.84 and 314.24 is: 433.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.31 : 677.84 = 314.24 : x
  2. Step 2: Convert to fraction form
    491.31/677.84 = 314.24/x
  3. Step 3: Cross multiply
    491.31x = 677.84 × 314.24
  4. Step 4: Simplify right side
    491.31x = 212,999.48
  5. Step 5: Solve for x
    x = 212,999.48/491.31
  6. Step 6: Final answer
    x = 433.53

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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.