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Finding the Fourth Proportional to 125,855.80, 189,002.40 and 121,919.20

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Solution

The fourth proportional to 125,855.80, 189,002.40 and 121,919.20 is: 183,090.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,855.80 : 189,002.40 = 121,919.20 : x
  2. Step 2: Convert to fraction form
    125,855.80/189,002.40 = 121,919.20/x
  3. Step 3: Cross multiply
    125,855.80x = 189,002.40 × 121,919.20
  4. Step 4: Simplify right side
    125,855.80x = 23,043,021,406.08
  5. Step 5: Solve for x
    x = 23,043,021,406.08/125,855.80
  6. Step 6: Final answer
    x = 183,090.66

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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.