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Finding the Fourth Proportional to 689.43, 950.90 and 558.39

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Solution

The fourth proportional to 689.43, 950.90 and 558.39 is: 770.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.43 : 950.90 = 558.39 : x
  2. Step 2: Convert to fraction form
    689.43/950.90 = 558.39/x
  3. Step 3: Cross multiply
    689.43x = 950.90 × 558.39
  4. Step 4: Simplify right side
    689.43x = 530,970.26
  5. Step 5: Solve for x
    x = 530,970.26/689.43
  6. Step 6: Final answer
    x = 770.16

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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.