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Finding the Fourth Proportional to 1,015.70, 1,401.78 and 849.62

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Solution

The fourth proportional to 1,015.70, 1,401.78 and 849.62 is: 1,172.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.70 : 1,401.78 = 849.62 : x
  2. Step 2: Convert to fraction form
    1,015.70/1,401.78 = 849.62/x
  3. Step 3: Cross multiply
    1,015.70x = 1,401.78 × 849.62
  4. Step 4: Simplify right side
    1,015.70x = 1,190,980.32
  5. Step 5: Solve for x
    x = 1,190,980.32/1,015.70
  6. Step 6: Final answer
    x = 1,172.57

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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.