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Finding the Fourth Proportional to 128,051.80, 191,904.90 and 91,072.60

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Solution

The fourth proportional to 128,051.80, 191,904.90 and 91,072.60 is: 136,486.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.80 : 191,904.90 = 91,072.60 : x
  2. Step 2: Convert to fraction form
    128,051.80/191,904.90 = 91,072.60/x
  3. Step 3: Cross multiply
    128,051.80x = 191,904.90 × 91,072.60
  4. Step 4: Simplify right side
    128,051.80x = 17,477,278,195.74
  5. Step 5: Solve for x
    x = 17,477,278,195.74/128,051.80
  6. Step 6: Final answer
    x = 136,486.00

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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.