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Finding the Fourth Proportional to 125,639.10, 188,130.60 and 81,024.30

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Solution

The fourth proportional to 125,639.10, 188,130.60 and 81,024.30 is: 121,324.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,639.10 : 188,130.60 = 81,024.30 : x
  2. Step 2: Convert to fraction form
    125,639.10/188,130.60 = 81,024.30/x
  3. Step 3: Cross multiply
    125,639.10x = 188,130.60 × 81,024.30
  4. Step 4: Simplify right side
    125,639.10x = 15,243,150,173.58
  5. Step 5: Solve for x
    x = 15,243,150,173.58/125,639.10
  6. Step 6: Final answer
    x = 121,324.89

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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.