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Finding the Fourth Proportional to 513.64, 708.72 and 339.28

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Solution

The fourth proportional to 513.64, 708.72 and 339.28 is: 468.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.64 : 708.72 = 339.28 : x
  2. Step 2: Convert to fraction form
    513.64/708.72 = 339.28/x
  3. Step 3: Cross multiply
    513.64x = 708.72 × 339.28
  4. Step 4: Simplify right side
    513.64x = 240,454.52
  5. Step 5: Solve for x
    x = 240,454.52/513.64
  6. Step 6: Final answer
    x = 468.14

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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.