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Finding the Fourth Proportional to 8,919.86, 12,309.41 and 5,383.07

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Solution

The fourth proportional to 8,919.86, 12,309.41 and 5,383.07 is: 7,428.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.86 : 12,309.41 = 5,383.07 : x
  2. Step 2: Convert to fraction form
    8,919.86/12,309.41 = 5,383.07/x
  3. Step 3: Cross multiply
    8,919.86x = 12,309.41 × 5,383.07
  4. Step 4: Simplify right side
    8,919.86x = 66,262,415.69
  5. Step 5: Solve for x
    x = 66,262,415.69/8,919.86
  6. Step 6: Final answer
    x = 7,428.64

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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.