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Finding the Fourth Proportional to 1,355.59, 2,033.39 and 987.74

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Solution

The fourth proportional to 1,355.59, 2,033.39 and 987.74 is: 1,481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.59 : 2,033.39 = 987.74 : x
  2. Step 2: Convert to fraction form
    1,355.59/2,033.39 = 987.74/x
  3. Step 3: Cross multiply
    1,355.59x = 2,033.39 × 987.74
  4. Step 4: Simplify right side
    1,355.59x = 2,008,460.64
  5. Step 5: Solve for x
    x = 2,008,460.64/1,355.59
  6. Step 6: Final answer
    x = 1,481.61

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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.