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Finding the Fourth Proportional to 518.75, 715.89 and 285.89

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Solution

The fourth proportional to 518.75, 715.89 and 285.89 is: 394.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.75 : 715.89 = 285.89 : x
  2. Step 2: Convert to fraction form
    518.75/715.89 = 285.89/x
  3. Step 3: Cross multiply
    518.75x = 715.89 × 285.89
  4. Step 4: Simplify right side
    518.75x = 204,665.79
  5. Step 5: Solve for x
    x = 204,665.79/518.75
  6. Step 6: Final answer
    x = 394.54

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1.5x scale

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.