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Finding the Fourth Proportional to 8,989.72, 12,409.62 and 5,631.80

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Solution

The fourth proportional to 8,989.72, 12,409.62 and 5,631.80 is: 7,774.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,989.72 : 12,409.62 = 5,631.80 : x
  2. Step 2: Convert to fraction form
    8,989.72/12,409.62 = 5,631.80/x
  3. Step 3: Cross multiply
    8,989.72x = 12,409.62 × 5,631.80
  4. Step 4: Simplify right side
    8,989.72x = 69,888,528.94
  5. Step 5: Solve for x
    x = 69,888,528.94/8,989.72
  6. Step 6: Final answer
    x = 7,774.27

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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.