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Finding the Fourth Proportional to 940.95, 1,297.15 and 660.31

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Solution

The fourth proportional to 940.95, 1,297.15 and 660.31 is: 910.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.95 : 1,297.15 = 660.31 : x
  2. Step 2: Convert to fraction form
    940.95/1,297.15 = 660.31/x
  3. Step 3: Cross multiply
    940.95x = 1,297.15 × 660.31
  4. Step 4: Simplify right side
    940.95x = 856,521.12
  5. Step 5: Solve for x
    x = 856,521.12/940.95
  6. Step 6: Final answer
    x = 910.27

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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.