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Finding the Fourth Proportional to 18,912.94, 28,385.79 and 18,869.20

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Solution

The fourth proportional to 18,912.94, 28,385.79 and 18,869.20 is: 28,320.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.94 : 28,385.79 = 18,869.20 : x
  2. Step 2: Convert to fraction form
    18,912.94/28,385.79 = 18,869.20/x
  3. Step 3: Cross multiply
    18,912.94x = 28,385.79 × 18,869.20
  4. Step 4: Simplify right side
    18,912.94x = 535,617,148.67
  5. Step 5: Solve for x
    x = 535,617,148.67/18,912.94
  6. Step 6: Final answer
    x = 28,320.14

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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.