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Finding the Fourth Proportional to 9,905.75, 14,877.13 and 8,720.21

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Solution

The fourth proportional to 9,905.75, 14,877.13 and 8,720.21 is: 13,096.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,905.75 : 14,877.13 = 8,720.21 : x
  2. Step 2: Convert to fraction form
    9,905.75/14,877.13 = 8,720.21/x
  3. Step 3: Cross multiply
    9,905.75x = 14,877.13 × 8,720.21
  4. Step 4: Simplify right side
    9,905.75x = 129,731,697.80
  5. Step 5: Solve for x
    x = 129,731,697.80/9,905.75
  6. Step 6: Final answer
    x = 13,096.61

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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.