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Finding the Fourth Proportional to 521.37, 719.60 and 355.97

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Solution

The fourth proportional to 521.37, 719.60 and 355.97 is: 491.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.37 : 719.60 = 355.97 : x
  2. Step 2: Convert to fraction form
    521.37/719.60 = 355.97/x
  3. Step 3: Cross multiply
    521.37x = 719.60 × 355.97
  4. Step 4: Simplify right side
    521.37x = 256,156.01
  5. Step 5: Solve for x
    x = 256,156.01/521.37
  6. Step 6: Final answer
    x = 491.31

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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.