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Finding the Fourth Proportional to 1,420.73, 2,131.30 and 446.91

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Solution

The fourth proportional to 1,420.73, 2,131.30 and 446.91 is: 670.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.73 : 2,131.30 = 446.91 : x
  2. Step 2: Convert to fraction form
    1,420.73/2,131.30 = 446.91/x
  3. Step 3: Cross multiply
    1,420.73x = 2,131.30 × 446.91
  4. Step 4: Simplify right side
    1,420.73x = 952,499.28
  5. Step 5: Solve for x
    x = 952,499.28/1,420.73
  6. Step 6: Final answer
    x = 670.43

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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.