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Finding the Fourth Proportional to 1,180.78, 1,770.46 and 1,047.54

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Solution

The fourth proportional to 1,180.78, 1,770.46 and 1,047.54 is: 1,570.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.78 : 1,770.46 = 1,047.54 : x
  2. Step 2: Convert to fraction form
    1,180.78/1,770.46 = 1,047.54/x
  3. Step 3: Cross multiply
    1,180.78x = 1,770.46 × 1,047.54
  4. Step 4: Simplify right side
    1,180.78x = 1,854,627.67
  5. Step 5: Solve for x
    x = 1,854,627.67/1,180.78
  6. Step 6: Final answer
    x = 1,570.68

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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.