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Finding the Fourth Proportional to 8,905.60, 13,378.20 and 7,447.60

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Solution

The fourth proportional to 8,905.60, 13,378.20 and 7,447.60 is: 11,187.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.60 : 13,378.20 = 7,447.60 : x
  2. Step 2: Convert to fraction form
    8,905.60/13,378.20 = 7,447.60/x
  3. Step 3: Cross multiply
    8,905.60x = 13,378.20 × 7,447.60
  4. Step 4: Simplify right side
    8,905.60x = 99,635,482.32
  5. Step 5: Solve for x
    x = 99,635,482.32/8,905.60
  6. Step 6: Final answer
    x = 11,187.96

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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.