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Finding the Fourth Proportional to 739.80, 1,021 and 445.04

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Solution

The fourth proportional to 739.80, 1,021 and 445.04 is: 614.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.80 : 1,021 = 445.04 : x
  2. Step 2: Convert to fraction form
    739.80/1,021 = 445.04/x
  3. Step 3: Cross multiply
    739.80x = 1,021 × 445.04
  4. Step 4: Simplify right side
    739.80x = 454,385.84
  5. Step 5: Solve for x
    x = 454,385.84/739.80
  6. Step 6: Final answer
    x = 614.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.