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Finding the Fourth Proportional to 689.96, 953.07 and 679.93

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Solution

The fourth proportional to 689.96, 953.07 and 679.93 is: 939.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.96 : 953.07 = 679.93 : x
  2. Step 2: Convert to fraction form
    689.96/953.07 = 679.93/x
  3. Step 3: Cross multiply
    689.96x = 953.07 × 679.93
  4. Step 4: Simplify right side
    689.96x = 648,019.27
  5. Step 5: Solve for x
    x = 648,019.27/689.96
  6. Step 6: Final answer
    x = 939.21

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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.