Home / 5,121.78-7,681.46-1,424.13

Finding the Fourth Proportional to 5,121.78, 7,681.46 and 1,424.13

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Solution

The fourth proportional to 5,121.78, 7,681.46 and 1,424.13 is: 2,135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121.78 : 7,681.46 = 1,424.13 : x
  2. Step 2: Convert to fraction form
    5,121.78/7,681.46 = 1,424.13/x
  3. Step 3: Cross multiply
    5,121.78x = 7,681.46 × 1,424.13
  4. Step 4: Simplify right side
    5,121.78x = 10,939,390.51
  5. Step 5: Solve for x
    x = 10,939,390.51/5,121.78
  6. Step 6: Final answer
    x = 2,135.86

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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.