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Finding the Fourth Proportional to 91,978.54, 126,940.91 and 51,146.74

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Solution

The fourth proportional to 91,978.54, 126,940.91 and 51,146.74 is: 70,588.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,978.54 : 126,940.91 = 51,146.74 : x
  2. Step 2: Convert to fraction form
    91,978.54/126,940.91 = 51,146.74/x
  3. Step 3: Cross multiply
    91,978.54x = 126,940.91 × 51,146.74
  4. Step 4: Simplify right side
    91,978.54x = 6,492,613,837.85
  5. Step 5: Solve for x
    x = 6,492,613,837.85/91,978.54
  6. Step 6: Final answer
    x = 70,588.35

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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.