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Finding the Fourth Proportional to 522.40, 721.08 and 356.26

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Solution

The fourth proportional to 522.40, 721.08 and 356.26 is: 491.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.40 : 721.08 = 356.26 : x
  2. Step 2: Convert to fraction form
    522.40/721.08 = 356.26/x
  3. Step 3: Cross multiply
    522.40x = 721.08 × 356.26
  4. Step 4: Simplify right side
    522.40x = 256,891.96
  5. Step 5: Solve for x
    x = 256,891.96/522.40
  6. Step 6: Final answer
    x = 491.75

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1.5x scale

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.