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Finding the Fourth Proportional to 1,489.02, 2,053.80 and 991.41

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Solution

The fourth proportional to 1,489.02, 2,053.80 and 991.41 is: 1,367.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.02 : 2,053.80 = 991.41 : x
  2. Step 2: Convert to fraction form
    1,489.02/2,053.80 = 991.41/x
  3. Step 3: Cross multiply
    1,489.02x = 2,053.80 × 991.41
  4. Step 4: Simplify right side
    1,489.02x = 2,036,157.86
  5. Step 5: Solve for x
    x = 2,036,157.86/1,489.02
  6. Step 6: Final answer
    x = 1,367.45

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