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Finding the Fourth Proportional to 18,907.79, 28,346.19 and 7,822.43

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Solution

The fourth proportional to 18,907.79, 28,346.19 and 7,822.43 is: 11,727.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,907.79 : 28,346.19 = 7,822.43 : x
  2. Step 2: Convert to fraction form
    18,907.79/28,346.19 = 7,822.43/x
  3. Step 3: Cross multiply
    18,907.79x = 28,346.19 × 7,822.43
  4. Step 4: Simplify right side
    18,907.79x = 221,736,087.04
  5. Step 5: Solve for x
    x = 221,736,087.04/18,907.79
  6. Step 6: Final answer
    x = 11,727.23

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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.