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Finding the Fourth Proportional to 81,716.40, 112,761.72 and 45,903.60

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Solution

The fourth proportional to 81,716.40, 112,761.72 and 45,903.60 is: 63,343.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,716.40 : 112,761.72 = 45,903.60 : x
  2. Step 2: Convert to fraction form
    81,716.40/112,761.72 = 45,903.60/x
  3. Step 3: Cross multiply
    81,716.40x = 112,761.72 × 45,903.60
  4. Step 4: Simplify right side
    81,716.40x = 5,176,168,890.19
  5. Step 5: Solve for x
    x = 5,176,168,890.19/81,716.40
  6. Step 6: Final answer
    x = 63,343.09

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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.