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Finding the Fourth Proportional to 125,751.80, 188,846.40 and 121,815.20

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Solution

The fourth proportional to 125,751.80, 188,846.40 and 121,815.20 is: 182,934.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,751.80 : 188,846.40 = 121,815.20 : x
  2. Step 2: Convert to fraction form
    125,751.80/188,846.40 = 121,815.20/x
  3. Step 3: Cross multiply
    125,751.80x = 188,846.40 × 121,815.20
  4. Step 4: Simplify right side
    125,751.80x = 23,004,361,985.28
  5. Step 5: Solve for x
    x = 23,004,361,985.28/125,751.80
  6. Step 6: Final answer
    x = 182,934.65

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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.