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Finding the Fourth Proportional to 522.86, 784.26 and 138.11

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Solution

The fourth proportional to 522.86, 784.26 and 138.11 is: 207.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.86 : 784.26 = 138.11 : x
  2. Step 2: Convert to fraction form
    522.86/784.26 = 138.11/x
  3. Step 3: Cross multiply
    522.86x = 784.26 × 138.11
  4. Step 4: Simplify right side
    522.86x = 108,310.23
  5. Step 5: Solve for x
    x = 108,310.23/522.86
  6. Step 6: Final answer
    x = 207.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.