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Finding the Fourth Proportional to 1,181.67, 1,630.14 and 709.35

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Solution

The fourth proportional to 1,181.67, 1,630.14 and 709.35 is: 978.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.67 : 1,630.14 = 709.35 : x
  2. Step 2: Convert to fraction form
    1,181.67/1,630.14 = 709.35/x
  3. Step 3: Cross multiply
    1,181.67x = 1,630.14 × 709.35
  4. Step 4: Simplify right side
    1,181.67x = 1,156,339.81
  5. Step 5: Solve for x
    x = 1,156,339.81/1,181.67
  6. Step 6: Final answer
    x = 978.56

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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.