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Finding the Fourth Proportional to 1,112.32, 1,670.10 and 789.40

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Solution

The fourth proportional to 1,112.32, 1,670.10 and 789.40 is: 1,185.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.32 : 1,670.10 = 789.40 : x
  2. Step 2: Convert to fraction form
    1,112.32/1,670.10 = 789.40/x
  3. Step 3: Cross multiply
    1,112.32x = 1,670.10 × 789.40
  4. Step 4: Simplify right side
    1,112.32x = 1,318,376.94
  5. Step 5: Solve for x
    x = 1,318,376.94/1,112.32
  6. Step 6: Final answer
    x = 1,185.25

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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.