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Finding the Fourth Proportional to 1,175.98, 1,622.64 and 678.64

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Solution

The fourth proportional to 1,175.98, 1,622.64 and 678.64 is: 936.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.98 : 1,622.64 = 678.64 : x
  2. Step 2: Convert to fraction form
    1,175.98/1,622.64 = 678.64/x
  3. Step 3: Cross multiply
    1,175.98x = 1,622.64 × 678.64
  4. Step 4: Simplify right side
    1,175.98x = 1,101,188.41
  5. Step 5: Solve for x
    x = 1,101,188.41/1,175.98
  6. Step 6: Final answer
    x = 936.40

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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.