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Finding the Fourth Proportional to 1,368.74, 2,050.23 and 638.90

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Solution

The fourth proportional to 1,368.74, 2,050.23 and 638.90 is: 957.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.74 : 2,050.23 = 638.90 : x
  2. Step 2: Convert to fraction form
    1,368.74/2,050.23 = 638.90/x
  3. Step 3: Cross multiply
    1,368.74x = 2,050.23 × 638.90
  4. Step 4: Simplify right side
    1,368.74x = 1,309,891.95
  5. Step 5: Solve for x
    x = 1,309,891.95/1,368.74
  6. Step 6: Final answer
    x = 957.01

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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.