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Finding the Fourth Proportional to 862.04, 1,289.60 and 747.90

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Solution

The fourth proportional to 862.04, 1,289.60 and 747.90 is: 1,118.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.04 : 1,289.60 = 747.90 : x
  2. Step 2: Convert to fraction form
    862.04/1,289.60 = 747.90/x
  3. Step 3: Cross multiply
    862.04x = 1,289.60 × 747.90
  4. Step 4: Simplify right side
    862.04x = 964,491.84
  5. Step 5: Solve for x
    x = 964,491.84/862.04
  6. Step 6: Final answer
    x = 1,118.85

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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.