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Finding the Fourth Proportional to 91,708.90, 126,580.78 and 55,918.64

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Solution

The fourth proportional to 91,708.90, 126,580.78 and 55,918.64 is: 77,181.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,708.90 : 126,580.78 = 55,918.64 : x
  2. Step 2: Convert to fraction form
    91,708.90/126,580.78 = 55,918.64/x
  3. Step 3: Cross multiply
    91,708.90x = 126,580.78 × 55,918.64
  4. Step 4: Simplify right side
    91,708.90x = 7,078,225,067.74
  5. Step 5: Solve for x
    x = 7,078,225,067.74/91,708.90
  6. Step 6: Final answer
    x = 77,181.44

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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.