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Finding the Fourth Proportional to 8,879.40, 13,318.64 and 2,639.47

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Solution

The fourth proportional to 8,879.40, 13,318.64 and 2,639.47 is: 3,959.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,879.40 : 13,318.64 = 2,639.47 : x
  2. Step 2: Convert to fraction form
    8,879.40/13,318.64 = 2,639.47/x
  3. Step 3: Cross multiply
    8,879.40x = 13,318.64 × 2,639.47
  4. Step 4: Simplify right side
    8,879.40x = 35,154,150.72
  5. Step 5: Solve for x
    x = 35,154,150.72/8,879.40
  6. Step 6: Final answer
    x = 3,959.07

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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.