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Finding the Fourth Proportional to 849.12, 1,267.79 and 840.31

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Solution

The fourth proportional to 849.12, 1,267.79 and 840.31 is: 1,254.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.12 : 1,267.79 = 840.31 : x
  2. Step 2: Convert to fraction form
    849.12/1,267.79 = 840.31/x
  3. Step 3: Cross multiply
    849.12x = 1,267.79 × 840.31
  4. Step 4: Simplify right side
    849.12x = 1,065,329.24
  5. Step 5: Solve for x
    x = 1,065,329.24/849.12
  6. Step 6: Final answer
    x = 1,254.63

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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.