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Finding the Fourth Proportional to 1,175.64, 1,621.97 and 678.41

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Solution

The fourth proportional to 1,175.64, 1,621.97 and 678.41 is: 935.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.64 : 1,621.97 = 678.41 : x
  2. Step 2: Convert to fraction form
    1,175.64/1,621.97 = 678.41/x
  3. Step 3: Cross multiply
    1,175.64x = 1,621.97 × 678.41
  4. Step 4: Simplify right side
    1,175.64x = 1,100,349.17
  5. Step 5: Solve for x
    x = 1,100,349.17/1,175.64
  6. Step 6: Final answer
    x = 935.96

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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.