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Finding the Fourth Proportional to 8,991.60, 13,487.40 and 7,112.40

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Solution

The fourth proportional to 8,991.60, 13,487.40 and 7,112.40 is: 10,668.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.60 : 13,487.40 = 7,112.40 : x
  2. Step 2: Convert to fraction form
    8,991.60/13,487.40 = 7,112.40/x
  3. Step 3: Cross multiply
    8,991.60x = 13,487.40 × 7,112.40
  4. Step 4: Simplify right side
    8,991.60x = 95,927,783.76
  5. Step 5: Solve for x
    x = 95,927,783.76/8,991.60
  6. Step 6: Final answer
    x = 10,668.60

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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.