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Finding the Fourth Proportional to 786.21, 1,173.15 and 781.65

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Solution

The fourth proportional to 786.21, 1,173.15 and 781.65 is: 1,166.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.21 : 1,173.15 = 781.65 : x
  2. Step 2: Convert to fraction form
    786.21/1,173.15 = 781.65/x
  3. Step 3: Cross multiply
    786.21x = 1,173.15 × 781.65
  4. Step 4: Simplify right side
    786.21x = 916,992.70
  5. Step 5: Solve for x
    x = 916,992.70/786.21
  6. Step 6: Final answer
    x = 1,166.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.