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Finding the Fourth Proportional to 780.15, 1,170.45 and 746.49

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Solution

The fourth proportional to 780.15, 1,170.45 and 746.49 is: 1,119.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.15 : 1,170.45 = 746.49 : x
  2. Step 2: Convert to fraction form
    780.15/1,170.45 = 746.49/x
  3. Step 3: Cross multiply
    780.15x = 1,170.45 × 746.49
  4. Step 4: Simplify right side
    780.15x = 873,729.22
  5. Step 5: Solve for x
    x = 873,729.22/780.15
  6. Step 6: Final answer
    x = 1,119.95

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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.