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Finding the Fourth Proportional to 1,435.22, 1,975.74 and 1,287.80

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Solution

The fourth proportional to 1,435.22, 1,975.74 and 1,287.80 is: 1,772.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,435.22 : 1,975.74 = 1,287.80 : x
  2. Step 2: Convert to fraction form
    1,435.22/1,975.74 = 1,287.80/x
  3. Step 3: Cross multiply
    1,435.22x = 1,975.74 × 1,287.80
  4. Step 4: Simplify right side
    1,435.22x = 2,544,357.92
  5. Step 5: Solve for x
    x = 2,544,357.92/1,435.22
  6. Step 6: Final answer
    x = 1,772.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.