Home / 2,115.70-3,176.40-1,239.10

Finding the Fourth Proportional to 2,115.70, 3,176.40 and 1,239.10

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Solution

The fourth proportional to 2,115.70, 3,176.40 and 1,239.10 is: 1,860.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.70 : 3,176.40 = 1,239.10 : x
  2. Step 2: Convert to fraction form
    2,115.70/3,176.40 = 1,239.10/x
  3. Step 3: Cross multiply
    2,115.70x = 3,176.40 × 1,239.10
  4. Step 4: Simplify right side
    2,115.70x = 3,935,877.24
  5. Step 5: Solve for x
    x = 3,935,877.24/2,115.70
  6. Step 6: Final answer
    x = 1,860.32

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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.