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Finding the Fourth Proportional to 474.89, 654.69 and 317.55

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Solution

The fourth proportional to 474.89, 654.69 and 317.55 is: 437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.89 : 654.69 = 317.55 : x
  2. Step 2: Convert to fraction form
    474.89/654.69 = 317.55/x
  3. Step 3: Cross multiply
    474.89x = 654.69 × 317.55
  4. Step 4: Simplify right side
    474.89x = 207,896.81
  5. Step 5: Solve for x
    x = 207,896.81/474.89
  6. Step 6: Final answer
    x = 437.78

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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.