Home / 5,111.80-7,663.55-1,990.19

Finding the Fourth Proportional to 5,111.80, 7,663.55 and 1,990.19

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Solution

The fourth proportional to 5,111.80, 7,663.55 and 1,990.19 is: 2,983.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,111.80 : 7,663.55 = 1,990.19 : x
  2. Step 2: Convert to fraction form
    5,111.80/7,663.55 = 1,990.19/x
  3. Step 3: Cross multiply
    5,111.80x = 7,663.55 × 1,990.19
  4. Step 4: Simplify right side
    5,111.80x = 15,251,929.78
  5. Step 5: Solve for x
    x = 15,251,929.78/5,111.80
  6. Step 6: Final answer
    x = 2,983.67

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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.