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Finding the Fourth Proportional to 689.02, 951.75 and 512.38

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Solution

The fourth proportional to 689.02, 951.75 and 512.38 is: 707.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.02 : 951.75 = 512.38 : x
  2. Step 2: Convert to fraction form
    689.02/951.75 = 512.38/x
  3. Step 3: Cross multiply
    689.02x = 951.75 × 512.38
  4. Step 4: Simplify right side
    689.02x = 487,657.67
  5. Step 5: Solve for x
    x = 487,657.67/689.02
  6. Step 6: Final answer
    x = 707.76

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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.