Home / 5,138.80-7,708.18-1,243.20

Finding the Fourth Proportional to 5,138.80, 7,708.18 and 1,243.20

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Solution

The fourth proportional to 5,138.80, 7,708.18 and 1,243.20 is: 1,864.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,138.80 : 7,708.18 = 1,243.20 : x
  2. Step 2: Convert to fraction form
    5,138.80/7,708.18 = 1,243.20/x
  3. Step 3: Cross multiply
    5,138.80x = 7,708.18 × 1,243.20
  4. Step 4: Simplify right side
    5,138.80x = 9,582,809.38
  5. Step 5: Solve for x
    x = 9,582,809.38/5,138.80
  6. Step 6: Final answer
    x = 1,864.80

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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.