Home / 2,985.76-4,122.14-1,939.80

Finding the Fourth Proportional to 2,985.76, 4,122.14 and 1,939.80

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Solution

The fourth proportional to 2,985.76, 4,122.14 and 1,939.80 is: 2,678.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.76 : 4,122.14 = 1,939.80 : x
  2. Step 2: Convert to fraction form
    2,985.76/4,122.14 = 1,939.80/x
  3. Step 3: Cross multiply
    2,985.76x = 4,122.14 × 1,939.80
  4. Step 4: Simplify right side
    2,985.76x = 7,996,127.17
  5. Step 5: Solve for x
    x = 7,996,127.17/2,985.76
  6. Step 6: Final answer
    x = 2,678.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.