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Finding the Fourth Proportional to 81,434.70, 112,410.99 and 79,187.49

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Solution

The fourth proportional to 81,434.70, 112,410.99 and 79,187.49 is: 109,308.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,434.70 : 112,410.99 = 79,187.49 : x
  2. Step 2: Convert to fraction form
    81,434.70/112,410.99 = 79,187.49/x
  3. Step 3: Cross multiply
    81,434.70x = 112,410.99 × 79,187.49
  4. Step 4: Simplify right side
    81,434.70x = 8,901,544,146.52
  5. Step 5: Solve for x
    x = 8,901,544,146.52/81,434.70
  6. Step 6: Final answer
    x = 109,308.98

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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.