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Finding the Fourth Proportional to 501.78, 691.79 and 383.82

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Solution

The fourth proportional to 501.78, 691.79 and 383.82 is: 529.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.78 : 691.79 = 383.82 : x
  2. Step 2: Convert to fraction form
    501.78/691.79 = 383.82/x
  3. Step 3: Cross multiply
    501.78x = 691.79 × 383.82
  4. Step 4: Simplify right side
    501.78x = 265,520.92
  5. Step 5: Solve for x
    x = 265,520.92/501.78
  6. Step 6: Final answer
    x = 529.16

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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.