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Finding the Fourth Proportional to 1,968.87, 2,717.10 and 1,129.74

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Solution

The fourth proportional to 1,968.87, 2,717.10 and 1,129.74 is: 1,559.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,968.87 : 2,717.10 = 1,129.74 : x
  2. Step 2: Convert to fraction form
    1,968.87/2,717.10 = 1,129.74/x
  3. Step 3: Cross multiply
    1,968.87x = 2,717.10 × 1,129.74
  4. Step 4: Simplify right side
    1,968.87x = 3,069,620.53
  5. Step 5: Solve for x
    x = 3,069,620.53/1,968.87
  6. Step 6: Final answer
    x = 1,559.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.