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Finding the Fourth Proportional to 512.60, 707.38 and 279.72

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Solution

The fourth proportional to 512.60, 707.38 and 279.72 is: 386.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.60 : 707.38 = 279.72 : x
  2. Step 2: Convert to fraction form
    512.60/707.38 = 279.72/x
  3. Step 3: Cross multiply
    512.60x = 707.38 × 279.72
  4. Step 4: Simplify right side
    512.60x = 197,868.33
  5. Step 5: Solve for x
    x = 197,868.33/512.60
  6. Step 6: Final answer
    x = 386.01

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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.