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Finding the Fourth Proportional to 521.13, 719.16 and 288.25

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Solution

The fourth proportional to 521.13, 719.16 and 288.25 is: 397.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.13 : 719.16 = 288.25 : x
  2. Step 2: Convert to fraction form
    521.13/719.16 = 288.25/x
  3. Step 3: Cross multiply
    521.13x = 719.16 × 288.25
  4. Step 4: Simplify right side
    521.13x = 207,297.87
  5. Step 5: Solve for x
    x = 207,297.87/521.13
  6. Step 6: Final answer
    x = 397.79

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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.