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Finding the Fourth Proportional to 1,181.54, 1,770.63 and 870.95

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Solution

The fourth proportional to 1,181.54, 1,770.63 and 870.95 is: 1,305.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.54 : 1,770.63 = 870.95 : x
  2. Step 2: Convert to fraction form
    1,181.54/1,770.63 = 870.95/x
  3. Step 3: Cross multiply
    1,181.54x = 1,770.63 × 870.95
  4. Step 4: Simplify right side
    1,181.54x = 1,542,130.20
  5. Step 5: Solve for x
    x = 1,542,130.20/1,181.54
  6. Step 6: Final answer
    x = 1,305.19

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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.