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Finding the Fourth Proportional to 491.31, 677.70 and 343.89

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Solution

The fourth proportional to 491.31, 677.70 and 343.89 is: 474.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.31 : 677.70 = 343.89 : x
  2. Step 2: Convert to fraction form
    491.31/677.70 = 343.89/x
  3. Step 3: Cross multiply
    491.31x = 677.70 × 343.89
  4. Step 4: Simplify right side
    491.31x = 233,054.25
  5. Step 5: Solve for x
    x = 233,054.25/491.31
  6. Step 6: Final answer
    x = 474.35

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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.