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Finding the Fourth Proportional to 419.68, 631.68 and 317.52

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Solution

The fourth proportional to 419.68, 631.68 and 317.52 is: 477.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.68 : 631.68 = 317.52 : x
  2. Step 2: Convert to fraction form
    419.68/631.68 = 317.52/x
  3. Step 3: Cross multiply
    419.68x = 631.68 × 317.52
  4. Step 4: Simplify right side
    419.68x = 200,571.03
  5. Step 5: Solve for x
    x = 200,571.03/419.68
  6. Step 6: Final answer
    x = 477.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.