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Finding the Fourth Proportional to 72,984.96, 100,889.28 and 65,105.28

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Solution

The fourth proportional to 72,984.96, 100,889.28 and 65,105.28 is: 89,996.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,984.96 : 100,889.28 = 65,105.28 : x
  2. Step 2: Convert to fraction form
    72,984.96/100,889.28 = 65,105.28/x
  3. Step 3: Cross multiply
    72,984.96x = 100,889.28 × 65,105.28
  4. Step 4: Simplify right side
    72,984.96x = 6,568,424,823.40
  5. Step 5: Solve for x
    x = 6,568,424,823.40/72,984.96
  6. Step 6: Final answer
    x = 89,996.96

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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.