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Finding the Fourth Proportional to 86,172.96, 128,627.84 and 79,840.56

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Solution

The fourth proportional to 86,172.96, 128,627.84 and 79,840.56 is: 119,175.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,172.96 : 128,627.84 = 79,840.56 : x
  2. Step 2: Convert to fraction form
    86,172.96/128,627.84 = 79,840.56/x
  3. Step 3: Cross multiply
    86,172.96x = 128,627.84 × 79,840.56
  4. Step 4: Simplify right side
    86,172.96x = 10,269,718,777.19
  5. Step 5: Solve for x
    x = 10,269,718,777.19/86,172.96
  6. Step 6: Final answer
    x = 119,175.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.