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Finding the Fourth Proportional to 786.13, 1,180.11 and 421.63

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Solution

The fourth proportional to 786.13, 1,180.11 and 421.63 is: 632.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.13 : 1,180.11 = 421.63 : x
  2. Step 2: Convert to fraction form
    786.13/1,180.11 = 421.63/x
  3. Step 3: Cross multiply
    786.13x = 1,180.11 × 421.63
  4. Step 4: Simplify right side
    786.13x = 497,568.76
  5. Step 5: Solve for x
    x = 497,568.76/786.13
  6. Step 6: Final answer
    x = 632.93

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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.