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Finding the Fourth Proportional to 7,542.40, 11,315.40 and 3,845.20

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Solution

The fourth proportional to 7,542.40, 11,315.40 and 3,845.20 is: 5,768.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,542.40 : 11,315.40 = 3,845.20 : x
  2. Step 2: Convert to fraction form
    7,542.40/11,315.40 = 3,845.20/x
  3. Step 3: Cross multiply
    7,542.40x = 11,315.40 × 3,845.20
  4. Step 4: Simplify right side
    7,542.40x = 43,509,976.08
  5. Step 5: Solve for x
    x = 43,509,976.08/7,542.40
  6. Step 6: Final answer
    x = 5,768.72

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1.5x scale

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.