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Finding the Fourth Proportional to 513.84, 708.90 and 317.28

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Solution

The fourth proportional to 513.84, 708.90 and 317.28 is: 437.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.84 : 708.90 = 317.28 : x
  2. Step 2: Convert to fraction form
    513.84/708.90 = 317.28/x
  3. Step 3: Cross multiply
    513.84x = 708.90 × 317.28
  4. Step 4: Simplify right side
    513.84x = 224,919.79
  5. Step 5: Solve for x
    x = 224,919.79/513.84
  6. Step 6: Final answer
    x = 437.72

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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.