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Finding the Fourth Proportional to 1,122.96, 1,544.99 and 989.58

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Solution

The fourth proportional to 1,122.96, 1,544.99 and 989.58 is: 1,361.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.96 : 1,544.99 = 989.58 : x
  2. Step 2: Convert to fraction form
    1,122.96/1,544.99 = 989.58/x
  3. Step 3: Cross multiply
    1,122.96x = 1,544.99 × 989.58
  4. Step 4: Simplify right side
    1,122.96x = 1,528,891.20
  5. Step 5: Solve for x
    x = 1,528,891.20/1,122.96
  6. Step 6: Final answer
    x = 1,361.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.