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Finding the Fourth Proportional to 1,270.17, 1,904.31 and 858.15

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Solution

The fourth proportional to 1,270.17, 1,904.31 and 858.15 is: 1,286.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.17 : 1,904.31 = 858.15 : x
  2. Step 2: Convert to fraction form
    1,270.17/1,904.31 = 858.15/x
  3. Step 3: Cross multiply
    1,270.17x = 1,904.31 × 858.15
  4. Step 4: Simplify right side
    1,270.17x = 1,634,183.63
  5. Step 5: Solve for x
    x = 1,634,183.63/1,270.17
  6. Step 6: Final answer
    x = 1,286.59

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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.