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Finding the Fourth Proportional to 689, 950.82 and 505.32

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Solution

The fourth proportional to 689, 950.82 and 505.32 is: 697.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    689 : 950.82 = 505.32 : x
  2. Step 2: Convert to fraction form
    689/950.82 = 505.32/x
  3. Step 3: Cross multiply
    689x = 950.82 × 505.32
  4. Step 4: Simplify right side
    689x = 480,468.36
  5. Step 5: Solve for x
    x = 480,468.36/689
  6. Step 6: Final answer
    x = 697.34

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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.