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Finding the Fourth Proportional to 1,362.58, 2,039.93 and 1,221.90

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Solution

The fourth proportional to 1,362.58, 2,039.93 and 1,221.90 is: 1,829.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,362.58 : 2,039.93 = 1,221.90 : x
  2. Step 2: Convert to fraction form
    1,362.58/2,039.93 = 1,221.90/x
  3. Step 3: Cross multiply
    1,362.58x = 2,039.93 × 1,221.90
  4. Step 4: Simplify right side
    1,362.58x = 2,492,590.47
  5. Step 5: Solve for x
    x = 2,492,590.47/1,362.58
  6. Step 6: Final answer
    x = 1,829.32

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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.