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Finding the Fourth Proportional to 319.12, 476.66 and 283.28

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Solution

The fourth proportional to 319.12, 476.66 and 283.28 is: 423.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.12 : 476.66 = 283.28 : x
  2. Step 2: Convert to fraction form
    319.12/476.66 = 283.28/x
  3. Step 3: Cross multiply
    319.12x = 476.66 × 283.28
  4. Step 4: Simplify right side
    319.12x = 135,028.24
  5. Step 5: Solve for x
    x = 135,028.24/319.12
  6. Step 6: Final answer
    x = 423.13

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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.