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Finding the Fourth Proportional to 1,175.12, 1,621.87 and 677.78

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Solution

The fourth proportional to 1,175.12, 1,621.87 and 677.78 is: 935.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.12 : 1,621.87 = 677.78 : x
  2. Step 2: Convert to fraction form
    1,175.12/1,621.87 = 677.78/x
  3. Step 3: Cross multiply
    1,175.12x = 1,621.87 × 677.78
  4. Step 4: Simplify right side
    1,175.12x = 1,099,261.24
  5. Step 5: Solve for x
    x = 1,099,261.24/1,175.12
  6. Step 6: Final answer
    x = 935.45

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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.