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Finding the Fourth Proportional to 857.70, 1,279.37 and 786.93

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Solution

The fourth proportional to 857.70, 1,279.37 and 786.93 is: 1,173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.70 : 1,279.37 = 786.93 : x
  2. Step 2: Convert to fraction form
    857.70/1,279.37 = 786.93/x
  3. Step 3: Cross multiply
    857.70x = 1,279.37 × 786.93
  4. Step 4: Simplify right side
    857.70x = 1,006,770.70
  5. Step 5: Solve for x
    x = 1,006,770.70/857.70
  6. Step 6: Final answer
    x = 1,173.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.