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Finding the Fourth Proportional to 8,742.48, 13,039.92 and 7,429.20

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Solution

The fourth proportional to 8,742.48, 13,039.92 and 7,429.20 is: 11,081.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,742.48 : 13,039.92 = 7,429.20 : x
  2. Step 2: Convert to fraction form
    8,742.48/13,039.92 = 7,429.20/x
  3. Step 3: Cross multiply
    8,742.48x = 13,039.92 × 7,429.20
  4. Step 4: Simplify right side
    8,742.48x = 96,876,173.66
  5. Step 5: Solve for x
    x = 96,876,173.66/8,742.48
  6. Step 6: Final answer
    x = 11,081.09

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1.5x scale

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.