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Finding the Fourth Proportional to 689, 950.88 and 378.56

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Solution

The fourth proportional to 689, 950.88 and 378.56 is: 522.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    689 : 950.88 = 378.56 : x
  2. Step 2: Convert to fraction form
    689/950.88 = 378.56/x
  3. Step 3: Cross multiply
    689x = 950.88 × 378.56
  4. Step 4: Simplify right side
    689x = 359,965.13
  5. Step 5: Solve for x
    x = 359,965.13/689
  6. Step 6: Final answer
    x = 522.45

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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.