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Finding the Fourth Proportional to 91,398.69, 126,129.30 and 51,111.99

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Solution

The fourth proportional to 91,398.69, 126,129.30 and 51,111.99 is: 70,534.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,398.69 : 126,129.30 = 51,111.99 : x
  2. Step 2: Convert to fraction form
    91,398.69/126,129.30 = 51,111.99/x
  3. Step 3: Cross multiply
    91,398.69x = 126,129.30 × 51,111.99
  4. Step 4: Simplify right side
    91,398.69x = 6,446,719,520.31
  5. Step 5: Solve for x
    x = 6,446,719,520.31/91,398.69
  6. Step 6: Final answer
    x = 70,534.05

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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.