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Finding the Fourth Proportional to 7,167.20, 9,890.64 and 4,023.20

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Solution

The fourth proportional to 7,167.20, 9,890.64 and 4,023.20 is: 5,551.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,167.20 : 9,890.64 = 4,023.20 : x
  2. Step 2: Convert to fraction form
    7,167.20/9,890.64 = 4,023.20/x
  3. Step 3: Cross multiply
    7,167.20x = 9,890.64 × 4,023.20
  4. Step 4: Simplify right side
    7,167.20x = 39,792,022.85
  5. Step 5: Solve for x
    x = 39,792,022.85/7,167.20
  6. Step 6: Final answer
    x = 5,551.96

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1.5x scale

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.