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Finding the Fourth Proportional to 522.78, 721.08 and 417.69

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Solution

The fourth proportional to 522.78, 721.08 and 417.69 is: 576.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.78 : 721.08 = 417.69 : x
  2. Step 2: Convert to fraction form
    522.78/721.08 = 417.69/x
  3. Step 3: Cross multiply
    522.78x = 721.08 × 417.69
  4. Step 4: Simplify right side
    522.78x = 301,187.91
  5. Step 5: Solve for x
    x = 301,187.91/522.78
  6. Step 6: Final answer
    x = 576.13

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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.