Home / 149,128.40-205,790.96-81,145.64

Finding the Fourth Proportional to 149,128.40, 205,790.96 and 81,145.64

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Solution

The fourth proportional to 149,128.40, 205,790.96 and 81,145.64 is: 111,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,128.40 : 205,790.96 = 81,145.64 : x
  2. Step 2: Convert to fraction form
    149,128.40/205,790.96 = 81,145.64/x
  3. Step 3: Cross multiply
    149,128.40x = 205,790.96 × 81,145.64
  4. Step 4: Simplify right side
    149,128.40x = 16,699,039,872.76
  5. Step 5: Solve for x
    x = 16,699,039,872.76/149,128.40
  6. Step 6: Final answer
    x = 111,977.60

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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.