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Finding the Fourth Proportional to 99,391.64, 137,211.26 and 76,679.64

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Solution

The fourth proportional to 99,391.64, 137,211.26 and 76,679.64 is: 105,857.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,391.64 : 137,211.26 = 76,679.64 : x
  2. Step 2: Convert to fraction form
    99,391.64/137,211.26 = 76,679.64/x
  3. Step 3: Cross multiply
    99,391.64x = 137,211.26 × 76,679.64
  4. Step 4: Simplify right side
    99,391.64x = 10,521,309,637.35
  5. Step 5: Solve for x
    x = 10,521,309,637.35/99,391.64
  6. Step 6: Final answer
    x = 105,857.09

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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.