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Finding the Fourth Proportional to 8,929.86, 13,388.88 and 3,992.70

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Solution

The fourth proportional to 8,929.86, 13,388.88 and 3,992.70 is: 5,986.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,929.86 : 13,388.88 = 3,992.70 : x
  2. Step 2: Convert to fraction form
    8,929.86/13,388.88 = 3,992.70/x
  3. Step 3: Cross multiply
    8,929.86x = 13,388.88 × 3,992.70
  4. Step 4: Simplify right side
    8,929.86x = 53,457,781.18
  5. Step 5: Solve for x
    x = 53,457,781.18/8,929.86
  6. Step 6: Final answer
    x = 5,986.41

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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.