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Finding the Fourth Proportional to 15,038.97, 20,751.44 and 8,991.30

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Solution

The fourth proportional to 15,038.97, 20,751.44 and 8,991.30 is: 12,406.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,038.97 : 20,751.44 = 8,991.30 : x
  2. Step 2: Convert to fraction form
    15,038.97/20,751.44 = 8,991.30/x
  3. Step 3: Cross multiply
    15,038.97x = 20,751.44 × 8,991.30
  4. Step 4: Simplify right side
    15,038.97x = 186,582,505.91
  5. Step 5: Solve for x
    x = 186,582,505.91/15,038.97
  6. Step 6: Final answer
    x = 12,406.60

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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.