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Finding the Fourth Proportional to 491.64, 678.33 and 317.09

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Solution

The fourth proportional to 491.64, 678.33 and 317.09 is: 437.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.64 : 678.33 = 317.09 : x
  2. Step 2: Convert to fraction form
    491.64/678.33 = 317.09/x
  3. Step 3: Cross multiply
    491.64x = 678.33 × 317.09
  4. Step 4: Simplify right side
    491.64x = 215,086.68
  5. Step 5: Solve for x
    x = 215,086.68/491.64
  6. Step 6: Final answer
    x = 437.49

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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.