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Finding the Fourth Proportional to 1,181.79, 1,631.22 and 684.55

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Solution

The fourth proportional to 1,181.79, 1,631.22 and 684.55 is: 944.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.79 : 1,631.22 = 684.55 : x
  2. Step 2: Convert to fraction form
    1,181.79/1,631.22 = 684.55/x
  3. Step 3: Cross multiply
    1,181.79x = 1,631.22 × 684.55
  4. Step 4: Simplify right side
    1,181.79x = 1,116,643.49
  5. Step 5: Solve for x
    x = 1,116,643.49/1,181.79
  6. Step 6: Final answer
    x = 944.88

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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.