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Finding the Fourth Proportional to 849.13, 1,275.14 and 812.68

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Solution

The fourth proportional to 849.13, 1,275.14 and 812.68 is: 1,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.13 : 1,275.14 = 812.68 : x
  2. Step 2: Convert to fraction form
    849.13/1,275.14 = 812.68/x
  3. Step 3: Cross multiply
    849.13x = 1,275.14 × 812.68
  4. Step 4: Simplify right side
    849.13x = 1,036,280.78
  5. Step 5: Solve for x
    x = 1,036,280.78/849.13
  6. Step 6: Final answer
    x = 1,220.40

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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.