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Finding the Fourth Proportional to 940.97, 1,403.80 and 916.81

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Solution

The fourth proportional to 940.97, 1,403.80 and 916.81 is: 1,367.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.97 : 1,403.80 = 916.81 : x
  2. Step 2: Convert to fraction form
    940.97/1,403.80 = 916.81/x
  3. Step 3: Cross multiply
    940.97x = 1,403.80 × 916.81
  4. Step 4: Simplify right side
    940.97x = 1,287,017.88
  5. Step 5: Solve for x
    x = 1,287,017.88/940.97
  6. Step 6: Final answer
    x = 1,367.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.