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Finding the Fourth Proportional to 518.19, 715.07 and 285.32

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Solution

The fourth proportional to 518.19, 715.07 and 285.32 is: 393.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.19 : 715.07 = 285.32 : x
  2. Step 2: Convert to fraction form
    518.19/715.07 = 285.32/x
  3. Step 3: Cross multiply
    518.19x = 715.07 × 285.32
  4. Step 4: Simplify right side
    518.19x = 204,023.77
  5. Step 5: Solve for x
    x = 204,023.77/518.19
  6. Step 6: Final answer
    x = 393.72

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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.