Home / 1,121.40-1,683.45-1,113.30

Finding the Fourth Proportional to 1,121.40, 1,683.45 and 1,113.30

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Solution

The fourth proportional to 1,121.40, 1,683.45 and 1,113.30 is: 1,671.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.40 : 1,683.45 = 1,113.30 : x
  2. Step 2: Convert to fraction form
    1,121.40/1,683.45 = 1,113.30/x
  3. Step 3: Cross multiply
    1,121.40x = 1,683.45 × 1,113.30
  4. Step 4: Simplify right side
    1,121.40x = 1,874,184.89
  5. Step 5: Solve for x
    x = 1,874,184.89/1,121.40
  6. Step 6: Final answer
    x = 1,671.29

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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.