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Finding the Fourth Proportional to 2,386.62, 3,578.63 and 742.72

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Solution

The fourth proportional to 2,386.62, 3,578.63 and 742.72 is: 1,113.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,386.62 : 3,578.63 = 742.72 : x
  2. Step 2: Convert to fraction form
    2,386.62/3,578.63 = 742.72/x
  3. Step 3: Cross multiply
    2,386.62x = 3,578.63 × 742.72
  4. Step 4: Simplify right side
    2,386.62x = 2,657,920.07
  5. Step 5: Solve for x
    x = 2,657,920.07/2,386.62
  6. Step 6: Final answer
    x = 1,113.68

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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.