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Finding the Fourth Proportional to 18,911.94, 28,384.29 and 18,868.20

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Solution

The fourth proportional to 18,911.94, 28,384.29 and 18,868.20 is: 28,318.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.94 : 28,384.29 = 18,868.20 : x
  2. Step 2: Convert to fraction form
    18,911.94/28,384.29 = 18,868.20/x
  3. Step 3: Cross multiply
    18,911.94x = 28,384.29 × 18,868.20
  4. Step 4: Simplify right side
    18,911.94x = 535,560,460.58
  5. Step 5: Solve for x
    x = 535,560,460.58/18,911.94
  6. Step 6: Final answer
    x = 28,318.64

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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.