Home / 1,081.05-1,621.80-618.45

Finding the Fourth Proportional to 1,081.05, 1,621.80 and 618.45

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Solution

The fourth proportional to 1,081.05, 1,621.80 and 618.45 is: 927.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.05 : 1,621.80 = 618.45 : x
  2. Step 2: Convert to fraction form
    1,081.05/1,621.80 = 618.45/x
  3. Step 3: Cross multiply
    1,081.05x = 1,621.80 × 618.45
  4. Step 4: Simplify right side
    1,081.05x = 1,003,002.21
  5. Step 5: Solve for x
    x = 1,003,002.21/1,081.05
  6. Step 6: Final answer
    x = 927.80

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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.