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Finding the Fourth Proportional to 319.36, 476.16 and 315.84

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Solution

The fourth proportional to 319.36, 476.16 and 315.84 is: 470.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.36 : 476.16 = 315.84 : x
  2. Step 2: Convert to fraction form
    319.36/476.16 = 315.84/x
  3. Step 3: Cross multiply
    319.36x = 476.16 × 315.84
  4. Step 4: Simplify right side
    319.36x = 150,390.37
  5. Step 5: Solve for x
    x = 150,390.37/319.36
  6. Step 6: Final answer
    x = 470.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.