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Finding the Fourth Proportional to 86,115.72, 128,674.89 and 66,015.24

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Solution

The fourth proportional to 86,115.72, 128,674.89 and 66,015.24 is: 98,640.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,115.72 : 128,674.89 = 66,015.24 : x
  2. Step 2: Convert to fraction form
    86,115.72/128,674.89 = 66,015.24/x
  3. Step 3: Cross multiply
    86,115.72x = 128,674.89 × 66,015.24
  4. Step 4: Simplify right side
    86,115.72x = 8,494,503,745.32
  5. Step 5: Solve for x
    x = 8,494,503,745.32/86,115.72
  6. Step 6: Final answer
    x = 98,640.57

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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.