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Finding the Fourth Proportional to 786.17, 1,179.97 and 421.27

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Solution

The fourth proportional to 786.17, 1,179.97 and 421.27 is: 632.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.17 : 1,179.97 = 421.27 : x
  2. Step 2: Convert to fraction form
    786.17/1,179.97 = 421.27/x
  3. Step 3: Cross multiply
    786.17x = 1,179.97 × 421.27
  4. Step 4: Simplify right side
    786.17x = 497,081.96
  5. Step 5: Solve for x
    x = 497,081.96/786.17
  6. Step 6: Final answer
    x = 632.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.