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Finding the Fourth Proportional to 1,368.24, 2,049.48 and 638.40

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Solution

The fourth proportional to 1,368.24, 2,049.48 and 638.40 is: 956.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.24 : 2,049.48 = 638.40 : x
  2. Step 2: Convert to fraction form
    1,368.24/2,049.48 = 638.40/x
  3. Step 3: Cross multiply
    1,368.24x = 2,049.48 × 638.40
  4. Step 4: Simplify right side
    1,368.24x = 1,308,388.03
  5. Step 5: Solve for x
    x = 1,308,388.03/1,368.24
  6. Step 6: Final answer
    x = 956.26

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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.