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Finding the Fourth Proportional to 81,279.60, 113,869.20 and 81,279.60

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Solution

The fourth proportional to 81,279.60, 113,869.20 and 81,279.60 is: 113,869.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.60 : 113,869.20 = 81,279.60 : x
  2. Step 2: Convert to fraction form
    81,279.60/113,869.20 = 81,279.60/x
  3. Step 3: Cross multiply
    81,279.60x = 113,869.20 × 81,279.60
  4. Step 4: Simplify right side
    81,279.60x = 9,255,243,028.32
  5. Step 5: Solve for x
    x = 9,255,243,028.32/81,279.60
  6. Step 6: Final answer
    x = 113,869.20

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1.5x scale

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.