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Finding the Fourth Proportional to 862.92, 1,287.72 and 770.64

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Solution

The fourth proportional to 862.92, 1,287.72 and 770.64 is: 1,150.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.92 : 1,287.72 = 770.64 : x
  2. Step 2: Convert to fraction form
    862.92/1,287.72 = 770.64/x
  3. Step 3: Cross multiply
    862.92x = 1,287.72 × 770.64
  4. Step 4: Simplify right side
    862.92x = 992,368.54
  5. Step 5: Solve for x
    x = 992,368.54/862.92
  6. Step 6: Final answer
    x = 1,150.01

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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.