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Finding the Fourth Proportional to 1,174.94, 1,621.11 and 708.86

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Solution

The fourth proportional to 1,174.94, 1,621.11 and 708.86 is: 978.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.94 : 1,621.11 = 708.86 : x
  2. Step 2: Convert to fraction form
    1,174.94/1,621.11 = 708.86/x
  3. Step 3: Cross multiply
    1,174.94x = 1,621.11 × 708.86
  4. Step 4: Simplify right side
    1,174.94x = 1,149,140.03
  5. Step 5: Solve for x
    x = 1,149,140.03/1,174.94
  6. Step 6: Final answer
    x = 978.04

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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.