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Finding the Fourth Proportional to 1,237.81, 1,708.18 and 678.28

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Solution

The fourth proportional to 1,237.81, 1,708.18 and 678.28 is: 936.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.81 : 1,708.18 = 678.28 : x
  2. Step 2: Convert to fraction form
    1,237.81/1,708.18 = 678.28/x
  3. Step 3: Cross multiply
    1,237.81x = 1,708.18 × 678.28
  4. Step 4: Simplify right side
    1,237.81x = 1,158,620.94
  5. Step 5: Solve for x
    x = 1,158,620.94/1,237.81
  6. Step 6: Final answer
    x = 936.03

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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.