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Finding the Fourth Proportional to 940.61, 1,400.97 and 891.20

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Solution

The fourth proportional to 940.61, 1,400.97 and 891.20 is: 1,327.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.61 : 1,400.97 = 891.20 : x
  2. Step 2: Convert to fraction form
    940.61/1,400.97 = 891.20/x
  3. Step 3: Cross multiply
    940.61x = 1,400.97 × 891.20
  4. Step 4: Simplify right side
    940.61x = 1,248,544.46
  5. Step 5: Solve for x
    x = 1,248,544.46/940.61
  6. Step 6: Final answer
    x = 1,327.38

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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.