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Finding the Fourth Proportional to 1,175.15, 1,621.55 and 677.75

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Solution

The fourth proportional to 1,175.15, 1,621.55 and 677.75 is: 935.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.15 : 1,621.55 = 677.75 : x
  2. Step 2: Convert to fraction form
    1,175.15/1,621.55 = 677.75/x
  3. Step 3: Cross multiply
    1,175.15x = 1,621.55 × 677.75
  4. Step 4: Simplify right side
    1,175.15x = 1,098,999.10
  5. Step 5: Solve for x
    x = 1,098,999.10/1,175.15
  6. Step 6: Final answer
    x = 935.20

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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.