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Finding the Fourth Proportional to 81,428.43, 112,383.11 and 45,620.87

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Solution

The fourth proportional to 81,428.43, 112,383.11 and 45,620.87 is: 62,963.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,428.43 : 112,383.11 = 45,620.87 : x
  2. Step 2: Convert to fraction form
    81,428.43/112,383.11 = 45,620.87/x
  3. Step 3: Cross multiply
    81,428.43x = 112,383.11 × 45,620.87
  4. Step 4: Simplify right side
    81,428.43x = 5,127,014,461.49
  5. Step 5: Solve for x
    x = 5,127,014,461.49/81,428.43
  6. Step 6: Final answer
    x = 62,963.44

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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.