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Finding the Fourth Proportional to 518.12, 715.02 and 285.28

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Solution

The fourth proportional to 518.12, 715.02 and 285.28 is: 393.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.12 : 715.02 = 285.28 : x
  2. Step 2: Convert to fraction form
    518.12/715.02 = 285.28/x
  3. Step 3: Cross multiply
    518.12x = 715.02 × 285.28
  4. Step 4: Simplify right side
    518.12x = 203,980.91
  5. Step 5: Solve for x
    x = 203,980.91/518.12
  6. Step 6: Final answer
    x = 393.69

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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.