Home / 28,119.12-42,137.04-12,309.54

Finding the Fourth Proportional to 28,119.12, 42,137.04 and 12,309.54

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Solution

The fourth proportional to 28,119.12, 42,137.04 and 12,309.54 is: 18,446.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,119.12 : 42,137.04 = 12,309.54 : x
  2. Step 2: Convert to fraction form
    28,119.12/42,137.04 = 12,309.54/x
  3. Step 3: Cross multiply
    28,119.12x = 42,137.04 × 12,309.54
  4. Step 4: Simplify right side
    28,119.12x = 518,687,579.36
  5. Step 5: Solve for x
    x = 518,687,579.36/28,119.12
  6. Step 6: Final answer
    x = 18,446.08

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1.5x scale

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.