Home / 18,971.18-28,456.78-5,120.18

Finding the Fourth Proportional to 18,971.18, 28,456.78 and 5,120.18

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Solution

The fourth proportional to 18,971.18, 28,456.78 and 5,120.18 is: 7,680.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.18 : 28,456.78 = 5,120.18 : x
  2. Step 2: Convert to fraction form
    18,971.18/28,456.78 = 5,120.18/x
  3. Step 3: Cross multiply
    18,971.18x = 28,456.78 × 5,120.18
  4. Step 4: Simplify right side
    18,971.18x = 145,703,835.82
  5. Step 5: Solve for x
    x = 145,703,835.82/18,971.18
  6. Step 6: Final answer
    x = 7,680.27

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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.