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Finding the Fourth Proportional to 849.78, 1,266.69 and 812.88

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Solution

The fourth proportional to 849.78, 1,266.69 and 812.88 is: 1,211.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.78 : 1,266.69 = 812.88 : x
  2. Step 2: Convert to fraction form
    849.78/1,266.69 = 812.88/x
  3. Step 3: Cross multiply
    849.78x = 1,266.69 × 812.88
  4. Step 4: Simplify right side
    849.78x = 1,029,666.97
  5. Step 5: Solve for x
    x = 1,029,666.97/849.78
  6. Step 6: Final answer
    x = 1,211.69

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1.5x scale

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.