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Finding the Fourth Proportional to 99,789.75, 137,709.86 and 55,077.75

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Solution

The fourth proportional to 99,789.75, 137,709.86 and 55,077.75 is: 76,007.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,789.75 : 137,709.86 = 55,077.75 : x
  2. Step 2: Convert to fraction form
    99,789.75/137,709.86 = 55,077.75/x
  3. Step 3: Cross multiply
    99,789.75x = 137,709.86 × 55,077.75
  4. Step 4: Simplify right side
    99,789.75x = 7,584,748,966.23
  5. Step 5: Solve for x
    x = 7,584,748,966.23/99,789.75
  6. Step 6: Final answer
    x = 76,007.30

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1.5x scale

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.