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Finding the Fourth Proportional to 1,858.41, 2,784.40 and 979.60

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Solution

The fourth proportional to 1,858.41, 2,784.40 and 979.60 is: 1,467.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,858.41 : 2,784.40 = 979.60 : x
  2. Step 2: Convert to fraction form
    1,858.41/2,784.40 = 979.60/x
  3. Step 3: Cross multiply
    1,858.41x = 2,784.40 × 979.60
  4. Step 4: Simplify right side
    1,858.41x = 2,727,598.24
  5. Step 5: Solve for x
    x = 2,727,598.24/1,858.41
  6. Step 6: Final answer
    x = 1,467.71

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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.