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Finding the Fourth Proportional to 18,975.81, 28,449.05 and 7,129.34

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Solution

The fourth proportional to 18,975.81, 28,449.05 and 7,129.34 is: 10,688.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,975.81 : 28,449.05 = 7,129.34 : x
  2. Step 2: Convert to fraction form
    18,975.81/28,449.05 = 7,129.34/x
  3. Step 3: Cross multiply
    18,975.81x = 28,449.05 × 7,129.34
  4. Step 4: Simplify right side
    18,975.81x = 202,822,844.07
  5. Step 5: Solve for x
    x = 202,822,844.07/18,975.81
  6. Step 6: Final answer
    x = 10,688.49

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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.