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Finding the Fourth Proportional to 849.30, 1,271.55 and 762.90

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Solution

The fourth proportional to 849.30, 1,271.55 and 762.90 is: 1,142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.30 : 1,271.55 = 762.90 : x
  2. Step 2: Convert to fraction form
    849.30/1,271.55 = 762.90/x
  3. Step 3: Cross multiply
    849.30x = 1,271.55 × 762.90
  4. Step 4: Simplify right side
    849.30x = 970,065.50
  5. Step 5: Solve for x
    x = 970,065.50/849.30
  6. Step 6: Final answer
    x = 1,142.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.