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Finding the Fourth Proportional to 1,369.36, 2,054.72 and 638.81

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Solution

The fourth proportional to 1,369.36, 2,054.72 and 638.81 is: 958.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.36 : 2,054.72 = 638.81 : x
  2. Step 2: Convert to fraction form
    1,369.36/2,054.72 = 638.81/x
  3. Step 3: Cross multiply
    1,369.36x = 2,054.72 × 638.81
  4. Step 4: Simplify right side
    1,369.36x = 1,312,575.68
  5. Step 5: Solve for x
    x = 1,312,575.68/1,369.36
  6. Step 6: Final answer
    x = 958.53

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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.