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Finding the Fourth Proportional to 737.78, 1,105.45 and 520.90

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Solution

The fourth proportional to 737.78, 1,105.45 and 520.90 is: 780.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.78 : 1,105.45 = 520.90 : x
  2. Step 2: Convert to fraction form
    737.78/1,105.45 = 520.90/x
  3. Step 3: Cross multiply
    737.78x = 1,105.45 × 520.90
  4. Step 4: Simplify right side
    737.78x = 575,824.84
  5. Step 5: Solve for x
    x = 575,824.84/737.78
  6. Step 6: Final answer
    x = 780.49

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1.5x scale

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.