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Finding the Fourth Proportional to 513.57, 709.88 and 383.79

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Solution

The fourth proportional to 513.57, 709.88 and 383.79 is: 530.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    513.57 : 709.88 = 383.79 : x
  2. Step 2: Convert to fraction form
    513.57/709.88 = 383.79/x
  3. Step 3: Cross multiply
    513.57x = 709.88 × 383.79
  4. Step 4: Simplify right side
    513.57x = 272,442.93
  5. Step 5: Solve for x
    x = 272,442.93/513.57
  6. Step 6: Final answer
    x = 530.49

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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.