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Finding the Fourth Proportional to 85,361.83, 128,025.07 and 25,390.64

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Solution

The fourth proportional to 85,361.83, 128,025.07 and 25,390.64 is: 38,080.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,361.83 : 128,025.07 = 25,390.64 : x
  2. Step 2: Convert to fraction form
    85,361.83/128,025.07 = 25,390.64/x
  3. Step 3: Cross multiply
    85,361.83x = 128,025.07 × 25,390.64
  4. Step 4: Simplify right side
    85,361.83x = 3,250,638,719.93
  5. Step 5: Solve for x
    x = 3,250,638,719.93/85,361.83
  6. Step 6: Final answer
    x = 38,080.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.