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Finding the Fourth Proportional to 1,048.78, 1,447.44 and 690.18

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Solution

The fourth proportional to 1,048.78, 1,447.44 and 690.18 is: 952.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,048.78 : 1,447.44 = 690.18 : x
  2. Step 2: Convert to fraction form
    1,048.78/1,447.44 = 690.18/x
  3. Step 3: Cross multiply
    1,048.78x = 1,447.44 × 690.18
  4. Step 4: Simplify right side
    1,048.78x = 998,994.14
  5. Step 5: Solve for x
    x = 998,994.14/1,048.78
  6. Step 6: Final answer
    x = 952.53

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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.