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Finding the Fourth Proportional to 1,200.78, 1,657.19 and 676.85

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Solution

The fourth proportional to 1,200.78, 1,657.19 and 676.85 is: 934.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.78 : 1,657.19 = 676.85 : x
  2. Step 2: Convert to fraction form
    1,200.78/1,657.19 = 676.85/x
  3. Step 3: Cross multiply
    1,200.78x = 1,657.19 × 676.85
  4. Step 4: Simplify right side
    1,200.78x = 1,121,662.46
  5. Step 5: Solve for x
    x = 1,121,662.46/1,200.78
  6. Step 6: Final answer
    x = 934.11

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1.5x scale

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.