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Finding the Fourth Proportional to 511.68, 706.20 and 290.72

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Solution

The fourth proportional to 511.68, 706.20 and 290.72 is: 401.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.68 : 706.20 = 290.72 : x
  2. Step 2: Convert to fraction form
    511.68/706.20 = 290.72/x
  3. Step 3: Cross multiply
    511.68x = 706.20 × 290.72
  4. Step 4: Simplify right side
    511.68x = 205,306.46
  5. Step 5: Solve for x
    x = 205,306.46/511.68
  6. Step 6: Final answer
    x = 401.24

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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.