Home / 1,271.10-1,905.41-612.80

Finding the Fourth Proportional to 1,271.10, 1,905.41 and 612.80

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Solution

The fourth proportional to 1,271.10, 1,905.41 and 612.80 is: 918.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.10 : 1,905.41 = 612.80 : x
  2. Step 2: Convert to fraction form
    1,271.10/1,905.41 = 612.80/x
  3. Step 3: Cross multiply
    1,271.10x = 1,905.41 × 612.80
  4. Step 4: Simplify right side
    1,271.10x = 1,167,622.66
  5. Step 5: Solve for x
    x = 1,167,622.66/1,271.10
  6. Step 6: Final answer
    x = 918.59

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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.