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Finding the Fourth Proportional to 1,324.40, 1,988.21 and 839.48

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Solution

The fourth proportional to 1,324.40, 1,988.21 and 839.48 is: 1,260.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.40 : 1,988.21 = 839.48 : x
  2. Step 2: Convert to fraction form
    1,324.40/1,988.21 = 839.48/x
  3. Step 3: Cross multiply
    1,324.40x = 1,988.21 × 839.48
  4. Step 4: Simplify right side
    1,324.40x = 1,669,054.69
  5. Step 5: Solve for x
    x = 1,669,054.69/1,324.40
  6. Step 6: Final answer
    x = 1,260.24

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1.5x scale

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.