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Finding the Fourth Proportional to 2,987.74, 4,122.89 and 1,868.63

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Solution

The fourth proportional to 2,987.74, 4,122.89 and 1,868.63 is: 2,578.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987.74 : 4,122.89 = 1,868.63 : x
  2. Step 2: Convert to fraction form
    2,987.74/4,122.89 = 1,868.63/x
  3. Step 3: Cross multiply
    2,987.74x = 4,122.89 × 1,868.63
  4. Step 4: Simplify right side
    2,987.74x = 7,704,132.99
  5. Step 5: Solve for x
    x = 7,704,132.99/2,987.74
  6. Step 6: Final answer
    x = 2,578.58

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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.