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Finding the Fourth Proportional to 521.66, 719.17 and 355.59

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Solution

The fourth proportional to 521.66, 719.17 and 355.59 is: 490.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.66 : 719.17 = 355.59 : x
  2. Step 2: Convert to fraction form
    521.66/719.17 = 355.59/x
  3. Step 3: Cross multiply
    521.66x = 719.17 × 355.59
  4. Step 4: Simplify right side
    521.66x = 255,728.77
  5. Step 5: Solve for x
    x = 255,728.77/521.66
  6. Step 6: Final answer
    x = 490.22

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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.