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Finding the Fourth Proportional to 1,175.71, 1,622.58 and 678.37

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Solution

The fourth proportional to 1,175.71, 1,622.58 and 678.37 is: 936.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.71 : 1,622.58 = 678.37 : x
  2. Step 2: Convert to fraction form
    1,175.71/1,622.58 = 678.37/x
  3. Step 3: Cross multiply
    1,175.71x = 1,622.58 × 678.37
  4. Step 4: Simplify right side
    1,175.71x = 1,100,709.59
  5. Step 5: Solve for x
    x = 1,100,709.59/1,175.71
  6. Step 6: Final answer
    x = 936.21

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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.