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Finding the Fourth Proportional to 786.12, 1,179.18 and 317.80

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Solution

The fourth proportional to 786.12, 1,179.18 and 317.80 is: 476.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.12 : 1,179.18 = 317.80 : x
  2. Step 2: Convert to fraction form
    786.12/1,179.18 = 317.80/x
  3. Step 3: Cross multiply
    786.12x = 1,179.18 × 317.80
  4. Step 4: Simplify right side
    786.12x = 374,743.40
  5. Step 5: Solve for x
    x = 374,743.40/786.12
  6. Step 6: Final answer
    x = 476.70

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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.