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Finding the Fourth Proportional to 518.46, 715.47 and 285.57

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Solution

The fourth proportional to 518.46, 715.47 and 285.57 is: 394.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.46 : 715.47 = 285.57 : x
  2. Step 2: Convert to fraction form
    518.46/715.47 = 285.57/x
  3. Step 3: Cross multiply
    518.46x = 715.47 × 285.57
  4. Step 4: Simplify right side
    518.46x = 204,316.77
  5. Step 5: Solve for x
    x = 204,316.77/518.46
  6. Step 6: Final answer
    x = 394.08

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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.