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Finding the Fourth Proportional to 786.24, 1,177.44 and 663.20

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Solution

The fourth proportional to 786.24, 1,177.44 and 663.20 is: 993.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.24 : 1,177.44 = 663.20 : x
  2. Step 2: Convert to fraction form
    786.24/1,177.44 = 663.20/x
  3. Step 3: Cross multiply
    786.24x = 1,177.44 × 663.20
  4. Step 4: Simplify right side
    786.24x = 780,878.21
  5. Step 5: Solve for x
    x = 780,878.21/786.24
  6. Step 6: Final answer
    x = 993.18

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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.