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Finding the Fourth Proportional to 920.79, 1,269.09 and 671.70

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Solution

The fourth proportional to 920.79, 1,269.09 and 671.70 is: 925.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.79 : 1,269.09 = 671.70 : x
  2. Step 2: Convert to fraction form
    920.79/1,269.09 = 671.70/x
  3. Step 3: Cross multiply
    920.79x = 1,269.09 × 671.70
  4. Step 4: Simplify right side
    920.79x = 852,447.75
  5. Step 5: Solve for x
    x = 852,447.75/920.79
  6. Step 6: Final answer
    x = 925.78

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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.