Home / 1,121.31-1,670.04-1,108.53

Finding the Fourth Proportional to 1,121.31, 1,670.04 and 1,108.53

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Solution

The fourth proportional to 1,121.31, 1,670.04 and 1,108.53 is: 1,651.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.31 : 1,670.04 = 1,108.53 : x
  2. Step 2: Convert to fraction form
    1,121.31/1,670.04 = 1,108.53/x
  3. Step 3: Cross multiply
    1,121.31x = 1,670.04 × 1,108.53
  4. Step 4: Simplify right side
    1,121.31x = 1,851,289.44
  5. Step 5: Solve for x
    x = 1,851,289.44/1,121.31
  6. Step 6: Final answer
    x = 1,651.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.