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Finding the Fourth Proportional to 521.72, 718.99 and 355.66

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Solution

The fourth proportional to 521.72, 718.99 and 355.66 is: 490.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 718.99 = 355.66 : x
  2. Step 2: Convert to fraction form
    521.72/718.99 = 355.66/x
  3. Step 3: Cross multiply
    521.72x = 718.99 × 355.66
  4. Step 4: Simplify right side
    521.72x = 255,715.30
  5. Step 5: Solve for x
    x = 255,715.30/521.72
  6. Step 6: Final answer
    x = 490.13

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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.