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Finding the Fourth Proportional to 512.68, 707.49 and 279.81

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Solution

The fourth proportional to 512.68, 707.49 and 279.81 is: 386.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.68 : 707.49 = 279.81 : x
  2. Step 2: Convert to fraction form
    512.68/707.49 = 279.81/x
  3. Step 3: Cross multiply
    512.68x = 707.49 × 279.81
  4. Step 4: Simplify right side
    512.68x = 197,962.78
  5. Step 5: Solve for x
    x = 197,962.78/512.68
  6. Step 6: Final answer
    x = 386.13

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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.