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Finding the Fourth Proportional to 1,420.88, 2,131.11 and 446.99

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Solution

The fourth proportional to 1,420.88, 2,131.11 and 446.99 is: 670.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.88 : 2,131.11 = 446.99 : x
  2. Step 2: Convert to fraction form
    1,420.88/2,131.11 = 446.99/x
  3. Step 3: Cross multiply
    1,420.88x = 2,131.11 × 446.99
  4. Step 4: Simplify right side
    1,420.88x = 952,574.20
  5. Step 5: Solve for x
    x = 952,574.20/1,420.88
  6. Step 6: Final answer
    x = 670.41

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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.