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Finding the Fourth Proportional to 521.07, 718.99 and 288.19

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Solution

The fourth proportional to 521.07, 718.99 and 288.19 is: 397.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.07 : 718.99 = 288.19 : x
  2. Step 2: Convert to fraction form
    521.07/718.99 = 288.19/x
  3. Step 3: Cross multiply
    521.07x = 718.99 × 288.19
  4. Step 4: Simplify right side
    521.07x = 207,205.73
  5. Step 5: Solve for x
    x = 207,205.73/521.07
  6. Step 6: Final answer
    x = 397.65

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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.