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Finding the Fourth Proportional to 8,700.98, 11,999.61 and 7,021.85

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Solution

The fourth proportional to 8,700.98, 11,999.61 and 7,021.85 is: 9,683.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,700.98 : 11,999.61 = 7,021.85 : x
  2. Step 2: Convert to fraction form
    8,700.98/11,999.61 = 7,021.85/x
  3. Step 3: Cross multiply
    8,700.98x = 11,999.61 × 7,021.85
  4. Step 4: Simplify right side
    8,700.98x = 84,259,401.48
  5. Step 5: Solve for x
    x = 84,259,401.48/8,700.98
  6. Step 6: Final answer
    x = 9,683.90

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1.5x scale

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.