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Finding the Fourth Proportional to 18,739.81, 28,109.68 and 4,888.81

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Solution

The fourth proportional to 18,739.81, 28,109.68 and 4,888.81 is: 7,333.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,739.81 : 28,109.68 = 4,888.81 : x
  2. Step 2: Convert to fraction form
    18,739.81/28,109.68 = 4,888.81/x
  3. Step 3: Cross multiply
    18,739.81x = 28,109.68 × 4,888.81
  4. Step 4: Simplify right side
    18,739.81x = 137,422,776.98
  5. Step 5: Solve for x
    x = 137,422,776.98/18,739.81
  6. Step 6: Final answer
    x = 7,333.20

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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.