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Finding the Fourth Proportional to 689.79, 956.01 and 676.83

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Solution

The fourth proportional to 689.79, 956.01 and 676.83 is: 938.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.79 : 956.01 = 676.83 : x
  2. Step 2: Convert to fraction form
    689.79/956.01 = 676.83/x
  3. Step 3: Cross multiply
    689.79x = 956.01 × 676.83
  4. Step 4: Simplify right side
    689.79x = 647,056.25
  5. Step 5: Solve for x
    x = 647,056.25/689.79
  6. Step 6: Final answer
    x = 938.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.