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Finding the Fourth Proportional to 18,966.96, 28,455.30 and 7,281.09

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Solution

The fourth proportional to 18,966.96, 28,455.30 and 7,281.09 is: 10,923.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,966.96 : 28,455.30 = 7,281.09 : x
  2. Step 2: Convert to fraction form
    18,966.96/28,455.30 = 7,281.09/x
  3. Step 3: Cross multiply
    18,966.96x = 28,455.30 × 7,281.09
  4. Step 4: Simplify right side
    18,966.96x = 207,185,600.28
  5. Step 5: Solve for x
    x = 207,185,600.28/18,966.96
  6. Step 6: Final answer
    x = 10,923.50

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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.