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Finding the Fourth Proportional to 1,174.75, 1,621.16 and 709

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Solution

The fourth proportional to 1,174.75, 1,621.16 and 709 is: 978.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.75 : 1,621.16 = 709 : x
  2. Step 2: Convert to fraction form
    1,174.75/1,621.16 = 709/x
  3. Step 3: Cross multiply
    1,174.75x = 1,621.16 × 709
  4. Step 4: Simplify right side
    1,174.75x = 1,149,398.90
  5. Step 5: Solve for x
    x = 1,149,398.90/1,174.75
  6. Step 6: Final answer
    x = 978.42

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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.