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Finding the Fourth Proportional to 1,181.48, 1,630.13 and 709.11

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Solution

The fourth proportional to 1,181.48, 1,630.13 and 709.11 is: 978.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.48 : 1,630.13 = 709.11 : x
  2. Step 2: Convert to fraction form
    1,181.48/1,630.13 = 709.11/x
  3. Step 3: Cross multiply
    1,181.48x = 1,630.13 × 709.11
  4. Step 4: Simplify right side
    1,181.48x = 1,155,937.94
  5. Step 5: Solve for x
    x = 1,155,937.94/1,181.48
  6. Step 6: Final answer
    x = 978.39

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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.