Home / 20,892.08-31,328.04-12,129.20

Finding the Fourth Proportional to 20,892.08, 31,328.04 and 12,129.20

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Solution

The fourth proportional to 20,892.08, 31,328.04 and 12,129.20 is: 18,187.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.08 : 31,328.04 = 12,129.20 : x
  2. Step 2: Convert to fraction form
    20,892.08/31,328.04 = 12,129.20/x
  3. Step 3: Cross multiply
    20,892.08x = 31,328.04 × 12,129.20
  4. Step 4: Simplify right side
    20,892.08x = 379,984,062.77
  5. Step 5: Solve for x
    x = 379,984,062.77/20,892.08
  6. Step 6: Final answer
    x = 18,187.95

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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.