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Finding the Fourth Proportional to 2,478.51, 3,718.40 and 747.09

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Solution

The fourth proportional to 2,478.51, 3,718.40 and 747.09 is: 1,120.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,478.51 : 3,718.40 = 747.09 : x
  2. Step 2: Convert to fraction form
    2,478.51/3,718.40 = 747.09/x
  3. Step 3: Cross multiply
    2,478.51x = 3,718.40 × 747.09
  4. Step 4: Simplify right side
    2,478.51x = 2,777,975.72
  5. Step 5: Solve for x
    x = 2,777,975.72/2,478.51
  6. Step 6: Final answer
    x = 1,120.82

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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.