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Finding the Fourth Proportional to 757.10, 1,044.80 and 421

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Solution

The fourth proportional to 757.10, 1,044.80 and 421 is: 580.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.10 : 1,044.80 = 421 : x
  2. Step 2: Convert to fraction form
    757.10/1,044.80 = 421/x
  3. Step 3: Cross multiply
    757.10x = 1,044.80 × 421
  4. Step 4: Simplify right side
    757.10x = 439,860.80
  5. Step 5: Solve for x
    x = 439,860.80/757.10
  6. Step 6: Final answer
    x = 580.98

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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.