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Finding the Fourth Proportional to 125,921.80, 188,445.30 and 86,555.80

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Solution

The fourth proportional to 125,921.80, 188,445.30 and 86,555.80 is: 129,533.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,921.80 : 188,445.30 = 86,555.80 : x
  2. Step 2: Convert to fraction form
    125,921.80/188,445.30 = 86,555.80/x
  3. Step 3: Cross multiply
    125,921.80x = 188,445.30 × 86,555.80
  4. Step 4: Simplify right side
    125,921.80x = 16,311,033,697.74
  5. Step 5: Solve for x
    x = 16,311,033,697.74/125,921.80
  6. Step 6: Final answer
    x = 129,533.04

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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.