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Finding the Fourth Proportional to 1,270.17, 1,905.39 and 620.82

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Solution

The fourth proportional to 1,270.17, 1,905.39 and 620.82 is: 931.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.17 : 1,905.39 = 620.82 : x
  2. Step 2: Convert to fraction form
    1,270.17/1,905.39 = 620.82/x
  3. Step 3: Cross multiply
    1,270.17x = 1,905.39 × 620.82
  4. Step 4: Simplify right side
    1,270.17x = 1,182,904.22
  5. Step 5: Solve for x
    x = 1,182,904.22/1,270.17
  6. Step 6: Final answer
    x = 931.30

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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.