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Finding the Fourth Proportional to 521.18, 719.36 and 355.46

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Solution

The fourth proportional to 521.18, 719.36 and 355.46 is: 490.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.18 : 719.36 = 355.46 : x
  2. Step 2: Convert to fraction form
    521.18/719.36 = 355.46/x
  3. Step 3: Cross multiply
    521.18x = 719.36 × 355.46
  4. Step 4: Simplify right side
    521.18x = 255,701.93
  5. Step 5: Solve for x
    x = 255,701.93/521.18
  6. Step 6: Final answer
    x = 490.62

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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.