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Finding the Fourth Proportional to 18,838.68, 28,249.47 and 7,143.60

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Solution

The fourth proportional to 18,838.68, 28,249.47 and 7,143.60 is: 10,712.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.68 : 28,249.47 = 7,143.60 : x
  2. Step 2: Convert to fraction form
    18,838.68/28,249.47 = 7,143.60/x
  3. Step 3: Cross multiply
    18,838.68x = 28,249.47 × 7,143.60
  4. Step 4: Simplify right side
    18,838.68x = 201,802,913.89
  5. Step 5: Solve for x
    x = 201,802,913.89/18,838.68
  6. Step 6: Final answer
    x = 10,712.16

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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.