Home / 18,742.68-28,109.86-5,412.78

Finding the Fourth Proportional to 18,742.68, 28,109.86 and 5,412.78

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Solution

The fourth proportional to 18,742.68, 28,109.86 and 5,412.78 is: 8,117.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,742.68 : 28,109.86 = 5,412.78 : x
  2. Step 2: Convert to fraction form
    18,742.68/28,109.86 = 5,412.78/x
  3. Step 3: Cross multiply
    18,742.68x = 28,109.86 × 5,412.78
  4. Step 4: Simplify right side
    18,742.68x = 152,152,347.46
  5. Step 5: Solve for x
    x = 152,152,347.46/18,742.68
  6. Step 6: Final answer
    x = 8,117.96

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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.