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Finding the Fourth Proportional to 518.58, 715.66 and 285.72

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Solution

The fourth proportional to 518.58, 715.66 and 285.72 is: 394.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.58 : 715.66 = 285.72 : x
  2. Step 2: Convert to fraction form
    518.58/715.66 = 285.72/x
  3. Step 3: Cross multiply
    518.58x = 715.66 × 285.72
  4. Step 4: Simplify right side
    518.58x = 204,478.38
  5. Step 5: Solve for x
    x = 204,478.38/518.58
  6. Step 6: Final answer
    x = 394.30

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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.