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Finding the Fourth Proportional to 521.37, 718.89 and 355.68

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Solution

The fourth proportional to 521.37, 718.89 and 355.68 is: 490.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.37 : 718.89 = 355.68 : x
  2. Step 2: Convert to fraction form
    521.37/718.89 = 355.68/x
  3. Step 3: Cross multiply
    521.37x = 718.89 × 355.68
  4. Step 4: Simplify right side
    521.37x = 255,694.80
  5. Step 5: Solve for x
    x = 255,694.80/521.37
  6. Step 6: Final answer
    x = 490.43

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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.