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Finding the Fourth Proportional to 689.74, 951.86 and 427.90

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Solution

The fourth proportional to 689.74, 951.86 and 427.90 is: 590.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.74 : 951.86 = 427.90 : x
  2. Step 2: Convert to fraction form
    689.74/951.86 = 427.90/x
  3. Step 3: Cross multiply
    689.74x = 951.86 × 427.90
  4. Step 4: Simplify right side
    689.74x = 407,300.89
  5. Step 5: Solve for x
    x = 407,300.89/689.74
  6. Step 6: Final answer
    x = 590.51

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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.