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Finding the Fourth Proportional to 86,543.64, 119,484.24 and 66,361.68

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Solution

The fourth proportional to 86,543.64, 119,484.24 and 66,361.68 is: 91,620.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,543.64 : 119,484.24 = 66,361.68 : x
  2. Step 2: Convert to fraction form
    86,543.64/119,484.24 = 66,361.68/x
  3. Step 3: Cross multiply
    86,543.64x = 119,484.24 × 66,361.68
  4. Step 4: Simplify right side
    86,543.64x = 7,929,174,899.92
  5. Step 5: Solve for x
    x = 7,929,174,899.92/86,543.64
  6. Step 6: Final answer
    x = 91,620.54

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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.