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Finding the Fourth Proportional to 9,640.80, 14,461.20 and 7,999.20

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Solution

The fourth proportional to 9,640.80, 14,461.20 and 7,999.20 is: 11,998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,640.80 : 14,461.20 = 7,999.20 : x
  2. Step 2: Convert to fraction form
    9,640.80/14,461.20 = 7,999.20/x
  3. Step 3: Cross multiply
    9,640.80x = 14,461.20 × 7,999.20
  4. Step 4: Simplify right side
    9,640.80x = 115,678,031.04
  5. Step 5: Solve for x
    x = 115,678,031.04/9,640.80
  6. Step 6: Final answer
    x = 11,998.80

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Similar ratio
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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.