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Finding the Fourth Proportional to 1,018.08, 1,403.72 and 860.44

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Solution

The fourth proportional to 1,018.08, 1,403.72 and 860.44 is: 1,186.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.08 : 1,403.72 = 860.44 : x
  2. Step 2: Convert to fraction form
    1,018.08/1,403.72 = 860.44/x
  3. Step 3: Cross multiply
    1,018.08x = 1,403.72 × 860.44
  4. Step 4: Simplify right side
    1,018.08x = 1,207,817.09
  5. Step 5: Solve for x
    x = 1,207,817.09/1,018.08
  6. Step 6: Final answer
    x = 1,186.36

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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.