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Finding the Fourth Proportional to 100,136.50, 138,190.53 and 55,424.50

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Solution

The fourth proportional to 100,136.50, 138,190.53 and 55,424.50 is: 76,487.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,136.50 : 138,190.53 = 55,424.50 : x
  2. Step 2: Convert to fraction form
    100,136.50/138,190.53 = 55,424.50/x
  3. Step 3: Cross multiply
    100,136.50x = 138,190.53 × 55,424.50
  4. Step 4: Simplify right side
    100,136.50x = 7,659,141,029.99
  5. Step 5: Solve for x
    x = 7,659,141,029.99/100,136.50
  6. Step 6: Final answer
    x = 76,487.01

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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.