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Finding the Fourth Proportional to 8,909.28, 13,305.77 and 7,578.86

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Solution

The fourth proportional to 8,909.28, 13,305.77 and 7,578.86 is: 11,318.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,909.28 : 13,305.77 = 7,578.86 : x
  2. Step 2: Convert to fraction form
    8,909.28/13,305.77 = 7,578.86/x
  3. Step 3: Cross multiply
    8,909.28x = 13,305.77 × 7,578.86
  4. Step 4: Simplify right side
    8,909.28x = 100,842,492.02
  5. Step 5: Solve for x
    x = 100,842,492.02/8,909.28
  6. Step 6: Final answer
    x = 11,318.81

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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.