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Finding the Fourth Proportional to 850.70, 1,271.40 and 618.03

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Solution

The fourth proportional to 850.70, 1,271.40 and 618.03 is: 923.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.70 : 1,271.40 = 618.03 : x
  2. Step 2: Convert to fraction form
    850.70/1,271.40 = 618.03/x
  3. Step 3: Cross multiply
    850.70x = 1,271.40 × 618.03
  4. Step 4: Simplify right side
    850.70x = 785,761.02
  5. Step 5: Solve for x
    x = 785,761.02/850.70
  6. Step 6: Final answer
    x = 923.66

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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.