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Finding the Fourth Proportional to 1,270.49, 1,905.66 and 621

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Solution

The fourth proportional to 1,270.49, 1,905.66 and 621 is: 931.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.49 : 1,905.66 = 621 : x
  2. Step 2: Convert to fraction form
    1,270.49/1,905.66 = 621/x
  3. Step 3: Cross multiply
    1,270.49x = 1,905.66 × 621
  4. Step 4: Simplify right side
    1,270.49x = 1,183,414.86
  5. Step 5: Solve for x
    x = 1,183,414.86/1,270.49
  6. Step 6: Final answer
    x = 931.47

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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.