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Finding the Fourth Proportional to 1,321.45, 1,982.02 and 347.63

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Solution

The fourth proportional to 1,321.45, 1,982.02 and 347.63 is: 521.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.45 : 1,982.02 = 347.63 : x
  2. Step 2: Convert to fraction form
    1,321.45/1,982.02 = 347.63/x
  3. Step 3: Cross multiply
    1,321.45x = 1,982.02 × 347.63
  4. Step 4: Simplify right side
    1,321.45x = 688,997.96
  5. Step 5: Solve for x
    x = 688,997.96/1,321.45
  6. Step 6: Final answer
    x = 521.40

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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.