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Finding the Fourth Proportional to 18,991.55, 28,470.91 and 7,296.77

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Solution

The fourth proportional to 18,991.55, 28,470.91 and 7,296.77 is: 10,938.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.55 : 28,470.91 = 7,296.77 : x
  2. Step 2: Convert to fraction form
    18,991.55/28,470.91 = 7,296.77/x
  3. Step 3: Cross multiply
    18,991.55x = 28,470.91 × 7,296.77
  4. Step 4: Simplify right side
    18,991.55x = 207,745,681.96
  5. Step 5: Solve for x
    x = 207,745,681.96/18,991.55
  6. Step 6: Final answer
    x = 10,938.85

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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.