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Finding the Fourth Proportional to 18,866.45, 28,299.64 and 5,015.45

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Solution

The fourth proportional to 18,866.45, 28,299.64 and 5,015.45 is: 7,523.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,866.45 : 28,299.64 = 5,015.45 : x
  2. Step 2: Convert to fraction form
    18,866.45/28,299.64 = 5,015.45/x
  3. Step 3: Cross multiply
    18,866.45x = 28,299.64 × 5,015.45
  4. Step 4: Simplify right side
    18,866.45x = 141,935,262.86
  5. Step 5: Solve for x
    x = 141,935,262.86/18,866.45
  6. Step 6: Final answer
    x = 7,523.16

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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.