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Finding the Fourth Proportional to 1,718.91, 2,578.35 and 745.71

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Solution

The fourth proportional to 1,718.91, 2,578.35 and 745.71 is: 1,118.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.91 : 2,578.35 = 745.71 : x
  2. Step 2: Convert to fraction form
    1,718.91/2,578.35 = 745.71/x
  3. Step 3: Cross multiply
    1,718.91x = 2,578.35 × 745.71
  4. Step 4: Simplify right side
    1,718.91x = 1,922,701.38
  5. Step 5: Solve for x
    x = 1,922,701.38/1,718.91
  6. Step 6: Final answer
    x = 1,118.56

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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.