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Finding the Fourth Proportional to 511.79, 706.32 and 290.79

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Solution

The fourth proportional to 511.79, 706.32 and 290.79 is: 401.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.79 : 706.32 = 290.79 : x
  2. Step 2: Convert to fraction form
    511.79/706.32 = 290.79/x
  3. Step 3: Cross multiply
    511.79x = 706.32 × 290.79
  4. Step 4: Simplify right side
    511.79x = 205,390.79
  5. Step 5: Solve for x
    x = 205,390.79/511.79
  6. Step 6: Final answer
    x = 401.32

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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.