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Finding the Fourth Proportional to 318.29, 476.16 and 285.47

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Solution

The fourth proportional to 318.29, 476.16 and 285.47 is: 427.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.29 : 476.16 = 285.47 : x
  2. Step 2: Convert to fraction form
    318.29/476.16 = 285.47/x
  3. Step 3: Cross multiply
    318.29x = 476.16 × 285.47
  4. Step 4: Simplify right side
    318.29x = 135,929.40
  5. Step 5: Solve for x
    x = 135,929.40/318.29
  6. Step 6: Final answer
    x = 427.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.