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Finding the Fourth Proportional to 1,040.22, 1,434.56 and 685.89

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Solution

The fourth proportional to 1,040.22, 1,434.56 and 685.89 is: 945.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.22 : 1,434.56 = 685.89 : x
  2. Step 2: Convert to fraction form
    1,040.22/1,434.56 = 685.89/x
  3. Step 3: Cross multiply
    1,040.22x = 1,434.56 × 685.89
  4. Step 4: Simplify right side
    1,040.22x = 983,946.93
  5. Step 5: Solve for x
    x = 983,946.93/1,040.22
  6. Step 6: Final answer
    x = 945.90

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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.