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Finding the Fourth Proportional to 940.51, 1,298.17 and 660.81

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Solution

The fourth proportional to 940.51, 1,298.17 and 660.81 is: 912.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.51 : 1,298.17 = 660.81 : x
  2. Step 2: Convert to fraction form
    940.51/1,298.17 = 660.81/x
  3. Step 3: Cross multiply
    940.51x = 1,298.17 × 660.81
  4. Step 4: Simplify right side
    940.51x = 857,833.92
  5. Step 5: Solve for x
    x = 857,833.92/940.51
  6. Step 6: Final answer
    x = 912.10

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1.5x scale

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.