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Finding the Fourth Proportional to 1,270.67, 1,906.80 and 621.05

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Solution

The fourth proportional to 1,270.67, 1,906.80 and 621.05 is: 931.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.67 : 1,906.80 = 621.05 : x
  2. Step 2: Convert to fraction form
    1,270.67/1,906.80 = 621.05/x
  3. Step 3: Cross multiply
    1,270.67x = 1,906.80 × 621.05
  4. Step 4: Simplify right side
    1,270.67x = 1,184,208.61
  5. Step 5: Solve for x
    x = 1,184,208.61/1,270.67
  6. Step 6: Final answer
    x = 931.96

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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.