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Finding the Fourth Proportional to 786.29, 1,179.95 and 421.34

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Solution

The fourth proportional to 786.29, 1,179.95 and 421.34 is: 632.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.29 : 1,179.95 = 421.34 : x
  2. Step 2: Convert to fraction form
    786.29/1,179.95 = 421.34/x
  3. Step 3: Cross multiply
    786.29x = 1,179.95 × 421.34
  4. Step 4: Simplify right side
    786.29x = 497,152.13
  5. Step 5: Solve for x
    x = 497,152.13/786.29
  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.