Home / 20,990.31-28,965.49-12,038.19

Finding the Fourth Proportional to 20,990.31, 28,965.49 and 12,038.19

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Solution

The fourth proportional to 20,990.31, 28,965.49 and 12,038.19 is: 16,612.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.31 : 28,965.49 = 12,038.19 : x
  2. Step 2: Convert to fraction form
    20,990.31/28,965.49 = 12,038.19/x
  3. Step 3: Cross multiply
    20,990.31x = 28,965.49 × 12,038.19
  4. Step 4: Simplify right side
    20,990.31x = 348,692,072.06
  5. Step 5: Solve for x
    x = 348,692,072.06/20,990.31
  6. Step 6: Final answer
    x = 16,612.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.