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Finding the Fourth Proportional to 81,023.60, 121,535.40 and 69,748.40

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Solution

The fourth proportional to 81,023.60, 121,535.40 and 69,748.40 is: 104,622.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,023.60 : 121,535.40 = 69,748.40 : x
  2. Step 2: Convert to fraction form
    81,023.60/121,535.40 = 69,748.40/x
  3. Step 3: Cross multiply
    81,023.60x = 121,535.40 × 69,748.40
  4. Step 4: Simplify right side
    81,023.60x = 8,476,899,693.36
  5. Step 5: Solve for x
    x = 8,476,899,693.36/81,023.60
  6. Step 6: Final answer
    x = 104,622.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.