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Finding the Fourth Proportional to 1,178.96, 1,627.19 and 681.56

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Solution

The fourth proportional to 1,178.96, 1,627.19 and 681.56 is: 940.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.96 : 1,627.19 = 681.56 : x
  2. Step 2: Convert to fraction form
    1,178.96/1,627.19 = 681.56/x
  3. Step 3: Cross multiply
    1,178.96x = 1,627.19 × 681.56
  4. Step 4: Simplify right side
    1,178.96x = 1,109,033.88
  5. Step 5: Solve for x
    x = 1,109,033.88/1,178.96
  6. Step 6: Final answer
    x = 940.69

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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.