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Finding the Fourth Proportional to 1,321.49, 1,982.35 and 347.60

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Solution

The fourth proportional to 1,321.49, 1,982.35 and 347.60 is: 521.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.49 : 1,982.35 = 347.60 : x
  2. Step 2: Convert to fraction form
    1,321.49/1,982.35 = 347.60/x
  3. Step 3: Cross multiply
    1,321.49x = 1,982.35 × 347.60
  4. Step 4: Simplify right side
    1,321.49x = 689,064.86
  5. Step 5: Solve for x
    x = 689,064.86/1,321.49
  6. Step 6: Final answer
    x = 521.43

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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.