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Finding the Fourth Proportional to 18,983.90, 28,478.93 and 7,138.60

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Solution

The fourth proportional to 18,983.90, 28,478.93 and 7,138.60 is: 10,709.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,983.90 : 28,478.93 = 7,138.60 : x
  2. Step 2: Convert to fraction form
    18,983.90/28,478.93 = 7,138.60/x
  3. Step 3: Cross multiply
    18,983.90x = 28,478.93 × 7,138.60
  4. Step 4: Simplify right side
    18,983.90x = 203,299,582.81
  5. Step 5: Solve for x
    x = 203,299,582.81/18,983.90
  6. Step 6: Final answer
    x = 10,709.05

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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.