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Finding the Fourth Proportional to 521.39, 719.51 and 288.52

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Solution

The fourth proportional to 521.39, 719.51 and 288.52 is: 398.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.39 : 719.51 = 288.52 : x
  2. Step 2: Convert to fraction form
    521.39/719.51 = 288.52/x
  3. Step 3: Cross multiply
    521.39x = 719.51 × 288.52
  4. Step 4: Simplify right side
    521.39x = 207,593.03
  5. Step 5: Solve for x
    x = 207,593.03/521.39
  6. Step 6: Final answer
    x = 398.15

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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.