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Finding the Fourth Proportional to 99,431.88, 137,244.96 and 79,428.12

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Solution

The fourth proportional to 99,431.88, 137,244.96 and 79,428.12 is: 109,633.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,431.88 : 137,244.96 = 79,428.12 : x
  2. Step 2: Convert to fraction form
    99,431.88/137,244.96 = 79,428.12/x
  3. Step 3: Cross multiply
    99,431.88x = 137,244.96 × 79,428.12
  4. Step 4: Simplify right side
    99,431.88x = 10,901,109,152.28
  5. Step 5: Solve for x
    x = 10,901,109,152.28/99,431.88
  6. Step 6: Final answer
    x = 109,633.94

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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.