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Finding the Fourth Proportional to 512.66, 707.48 and 288.58

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Solution

The fourth proportional to 512.66, 707.48 and 288.58 is: 398.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.66 : 707.48 = 288.58 : x
  2. Step 2: Convert to fraction form
    512.66/707.48 = 288.58/x
  3. Step 3: Cross multiply
    512.66x = 707.48 × 288.58
  4. Step 4: Simplify right side
    512.66x = 204,164.02
  5. Step 5: Solve for x
    x = 204,164.02/512.66
  6. Step 6: Final answer
    x = 398.24

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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.