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Finding the Fourth Proportional to 3,698.12, 5,545.56 and 1,388

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Solution

The fourth proportional to 3,698.12, 5,545.56 and 1,388 is: 2,081.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,698.12 : 5,545.56 = 1,388 : x
  2. Step 2: Convert to fraction form
    3,698.12/5,545.56 = 1,388/x
  3. Step 3: Cross multiply
    3,698.12x = 5,545.56 × 1,388
  4. Step 4: Simplify right side
    3,698.12x = 7,697,237.28
  5. Step 5: Solve for x
    x = 7,697,237.28/3,698.12
  6. Step 6: Final answer
    x = 2,081.39

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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.