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Finding the Fourth Proportional to 8,905.60, 13,390.80 and 8,711.20

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Solution

The fourth proportional to 8,905.60, 13,390.80 and 8,711.20 is: 13,098.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.60 : 13,390.80 = 8,711.20 : x
  2. Step 2: Convert to fraction form
    8,905.60/13,390.80 = 8,711.20/x
  3. Step 3: Cross multiply
    8,905.60x = 13,390.80 × 8,711.20
  4. Step 4: Simplify right side
    8,905.60x = 116,649,936.96
  5. Step 5: Solve for x
    x = 116,649,936.96/8,905.60
  6. Step 6: Final answer
    x = 13,098.49

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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.