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Finding the Fourth Proportional to 920.95, 1,378.33 and 845.08

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Solution

The fourth proportional to 920.95, 1,378.33 and 845.08 is: 1,264.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.95 : 1,378.33 = 845.08 : x
  2. Step 2: Convert to fraction form
    920.95/1,378.33 = 845.08/x
  3. Step 3: Cross multiply
    920.95x = 1,378.33 × 845.08
  4. Step 4: Simplify right side
    920.95x = 1,164,793.56
  5. Step 5: Solve for x
    x = 1,164,793.56/920.95
  6. Step 6: Final answer
    x = 1,264.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.