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Finding the Fourth Proportional to 2,385.51, 3,578.85 and 742.41

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Solution

The fourth proportional to 2,385.51, 3,578.85 and 742.41 is: 1,113.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,385.51 : 3,578.85 = 742.41 : x
  2. Step 2: Convert to fraction form
    2,385.51/3,578.85 = 742.41/x
  3. Step 3: Cross multiply
    2,385.51x = 3,578.85 × 742.41
  4. Step 4: Simplify right side
    2,385.51x = 2,656,974.03
  5. Step 5: Solve for x
    x = 2,656,974.03/2,385.51
  6. Step 6: Final answer
    x = 1,113.80

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1.5x scale

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.