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Finding the Fourth Proportional to 940.65, 1,298.39 and 660.95

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Solution

The fourth proportional to 940.65, 1,298.39 and 660.95 is: 912.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.65 : 1,298.39 = 660.95 : x
  2. Step 2: Convert to fraction form
    940.65/1,298.39 = 660.95/x
  3. Step 3: Cross multiply
    940.65x = 1,298.39 × 660.95
  4. Step 4: Simplify right side
    940.65x = 858,161.07
  5. Step 5: Solve for x
    x = 858,161.07/940.65
  6. Step 6: Final answer
    x = 912.31

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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.