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Finding the Fourth Proportional to 81,280.10, 113,869.90 and 81,280.10

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Solution

The fourth proportional to 81,280.10, 113,869.90 and 81,280.10 is: 113,869.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,280.10 : 113,869.90 = 81,280.10 : x
  2. Step 2: Convert to fraction form
    81,280.10/113,869.90 = 81,280.10/x
  3. Step 3: Cross multiply
    81,280.10x = 113,869.90 × 81,280.10
  4. Step 4: Simplify right side
    81,280.10x = 9,255,356,858.99
  5. Step 5: Solve for x
    x = 9,255,356,858.99/81,280.10
  6. Step 6: Final answer
    x = 113,869.90

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.