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Finding the Fourth Proportional to 522.80, 721.36 and 315.80

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Solution

The fourth proportional to 522.80, 721.36 and 315.80 is: 435.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.80 : 721.36 = 315.80 : x
  2. Step 2: Convert to fraction form
    522.80/721.36 = 315.80/x
  3. Step 3: Cross multiply
    522.80x = 721.36 × 315.80
  4. Step 4: Simplify right side
    522.80x = 227,805.49
  5. Step 5: Solve for x
    x = 227,805.49/522.80
  6. Step 6: Final answer
    x = 435.74

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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.