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Finding the Fourth Proportional to 1,368.38, 2,051.15 and 638.43

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Solution

The fourth proportional to 1,368.38, 2,051.15 and 638.43 is: 956.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.38 : 2,051.15 = 638.43 : x
  2. Step 2: Convert to fraction form
    1,368.38/2,051.15 = 638.43/x
  3. Step 3: Cross multiply
    1,368.38x = 2,051.15 × 638.43
  4. Step 4: Simplify right side
    1,368.38x = 1,309,512.50
  5. Step 5: Solve for x
    x = 1,309,512.50/1,368.38
  6. Step 6: Final answer
    x = 956.98

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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.