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Finding the Fourth Proportional to 14,774.72, 20,390.32 and 8,489.12

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Solution

The fourth proportional to 14,774.72, 20,390.32 and 8,489.12 is: 11,715.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,774.72 : 20,390.32 = 8,489.12 : x
  2. Step 2: Convert to fraction form
    14,774.72/20,390.32 = 8,489.12/x
  3. Step 3: Cross multiply
    14,774.72x = 20,390.32 × 8,489.12
  4. Step 4: Simplify right side
    14,774.72x = 173,095,873.32
  5. Step 5: Solve for x
    x = 173,095,873.32/14,774.72
  6. Step 6: Final answer
    x = 11,715.68

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.