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Finding the Fourth Proportional to 18,912.40, 28,368.60 and 9,581.20

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Solution

The fourth proportional to 18,912.40, 28,368.60 and 9,581.20 is: 14,371.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.40 : 28,368.60 = 9,581.20 : x
  2. Step 2: Convert to fraction form
    18,912.40/28,368.60 = 9,581.20/x
  3. Step 3: Cross multiply
    18,912.40x = 28,368.60 × 9,581.20
  4. Step 4: Simplify right side
    18,912.40x = 271,805,230.32
  5. Step 5: Solve for x
    x = 271,805,230.32/18,912.40
  6. Step 6: Final answer
    x = 14,371.80

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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.