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Finding the Fourth Proportional to 512.99, 707.99 and 291.99

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Solution

The fourth proportional to 512.99, 707.99 and 291.99 is: 402.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.99 : 707.99 = 291.99 : x
  2. Step 2: Convert to fraction form
    512.99/707.99 = 291.99/x
  3. Step 3: Cross multiply
    512.99x = 707.99 × 291.99
  4. Step 4: Simplify right side
    512.99x = 206,724.54
  5. Step 5: Solve for x
    x = 206,724.54/512.99
  6. Step 6: Final answer
    x = 402.98

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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.