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Finding the Fourth Proportional to 1,290.87, 1,926.36 and 1,152.44

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Solution

The fourth proportional to 1,290.87, 1,926.36 and 1,152.44 is: 1,719.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.87 : 1,926.36 = 1,152.44 : x
  2. Step 2: Convert to fraction form
    1,290.87/1,926.36 = 1,152.44/x
  3. Step 3: Cross multiply
    1,290.87x = 1,926.36 × 1,152.44
  4. Step 4: Simplify right side
    1,290.87x = 2,220,014.32
  5. Step 5: Solve for x
    x = 2,220,014.32/1,290.87
  6. Step 6: Final answer
    x = 1,719.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.