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Finding the Fourth Proportional to 1,549.38, 2,138.58 and 989.58

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Solution

The fourth proportional to 1,549.38, 2,138.58 and 989.58 is: 1,365.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,549.38 : 2,138.58 = 989.58 : x
  2. Step 2: Convert to fraction form
    1,549.38/2,138.58 = 989.58/x
  3. Step 3: Cross multiply
    1,549.38x = 2,138.58 × 989.58
  4. Step 4: Simplify right side
    1,549.38x = 2,116,296.00
  5. Step 5: Solve for x
    x = 2,116,296.00/1,549.38
  6. Step 6: Final answer
    x = 1,365.90

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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.