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Finding the Fourth Proportional to 862.81, 1,190.69 and 578.72

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Solution

The fourth proportional to 862.81, 1,190.69 and 578.72 is: 798.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.81 : 1,190.69 = 578.72 : x
  2. Step 2: Convert to fraction form
    862.81/1,190.69 = 578.72/x
  3. Step 3: Cross multiply
    862.81x = 1,190.69 × 578.72
  4. Step 4: Simplify right side
    862.81x = 689,076.12
  5. Step 5: Solve for x
    x = 689,076.12/862.81
  6. Step 6: Final answer
    x = 798.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.