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Finding the Fourth Proportional to 846.18, 1,269.80 and 839.22

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Solution

The fourth proportional to 846.18, 1,269.80 and 839.22 is: 1,259.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    846.18 : 1,269.80 = 839.22 : x
  2. Step 2: Convert to fraction form
    846.18/1,269.80 = 839.22/x
  3. Step 3: Cross multiply
    846.18x = 1,269.80 × 839.22
  4. Step 4: Simplify right side
    846.18x = 1,065,637.36
  5. Step 5: Solve for x
    x = 1,065,637.36/846.18
  6. Step 6: Final answer
    x = 1,259.35

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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.