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Finding the Fourth Proportional to 1,331.39, 1,998.90 and 846.60

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Solution

The fourth proportional to 1,331.39, 1,998.90 and 846.60 is: 1,271.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.39 : 1,998.90 = 846.60 : x
  2. Step 2: Convert to fraction form
    1,331.39/1,998.90 = 846.60/x
  3. Step 3: Cross multiply
    1,331.39x = 1,998.90 × 846.60
  4. Step 4: Simplify right side
    1,331.39x = 1,692,268.74
  5. Step 5: Solve for x
    x = 1,692,268.74/1,331.39
  6. Step 6: Final answer
    x = 1,271.06

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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.