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Finding the Fourth Proportional to 11,999.80, 17,999.70 and 7,385.40

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Solution

The fourth proportional to 11,999.80, 17,999.70 and 7,385.40 is: 11,078.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,999.80 : 17,999.70 = 7,385.40 : x
  2. Step 2: Convert to fraction form
    11,999.80/17,999.70 = 7,385.40/x
  3. Step 3: Cross multiply
    11,999.80x = 17,999.70 × 7,385.40
  4. Step 4: Simplify right side
    11,999.80x = 132,934,984.38
  5. Step 5: Solve for x
    x = 132,934,984.38/11,999.80
  6. Step 6: Final answer
    x = 11,078.10

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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.