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Finding the Fourth Proportional to 786.14, 1,170.60 and 777.44

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Solution

The fourth proportional to 786.14, 1,170.60 and 777.44 is: 1,157.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.14 : 1,170.60 = 777.44 : x
  2. Step 2: Convert to fraction form
    786.14/1,170.60 = 777.44/x
  3. Step 3: Cross multiply
    786.14x = 1,170.60 × 777.44
  4. Step 4: Simplify right side
    786.14x = 910,071.26
  5. Step 5: Solve for x
    x = 910,071.26/786.14
  6. Step 6: Final answer
    x = 1,157.65

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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.