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Finding the Fourth Proportional to 318, 437.76 and 285.24

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Solution

The fourth proportional to 318, 437.76 and 285.24 is: 392.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    318 : 437.76 = 285.24 : x
  2. Step 2: Convert to fraction form
    318/437.76 = 285.24/x
  3. Step 3: Cross multiply
    318x = 437.76 × 285.24
  4. Step 4: Simplify right side
    318x = 124,866.66
  5. Step 5: Solve for x
    x = 124,866.66/318
  6. Step 6: Final answer
    x = 392.66

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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.