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Finding the Fourth Proportional to 511.18, 705.47 and 290.17

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Solution

The fourth proportional to 511.18, 705.47 and 290.17 is: 400.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.18 : 705.47 = 290.17 : x
  2. Step 2: Convert to fraction form
    511.18/705.47 = 290.17/x
  3. Step 3: Cross multiply
    511.18x = 705.47 × 290.17
  4. Step 4: Simplify right side
    511.18x = 204,706.23
  5. Step 5: Solve for x
    x = 204,706.23/511.18
  6. Step 6: Final answer
    x = 400.46

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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.