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Finding the Fourth Proportional to 1,235.69, 1,702.34 and 861.99

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Solution

The fourth proportional to 1,235.69, 1,702.34 and 861.99 is: 1,187.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.69 : 1,702.34 = 861.99 : x
  2. Step 2: Convert to fraction form
    1,235.69/1,702.34 = 861.99/x
  3. Step 3: Cross multiply
    1,235.69x = 1,702.34 × 861.99
  4. Step 4: Simplify right side
    1,235.69x = 1,467,395.75
  5. Step 5: Solve for x
    x = 1,467,395.75/1,235.69
  6. Step 6: Final answer
    x = 1,187.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.