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Finding the Fourth Proportional to 845.79, 1,269.23 and 412.71

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Solution

The fourth proportional to 845.79, 1,269.23 and 412.71 is: 619.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.79 : 1,269.23 = 412.71 : x
  2. Step 2: Convert to fraction form
    845.79/1,269.23 = 412.71/x
  3. Step 3: Cross multiply
    845.79x = 1,269.23 × 412.71
  4. Step 4: Simplify right side
    845.79x = 523,823.91
  5. Step 5: Solve for x
    x = 523,823.91/845.79
  6. Step 6: Final answer
    x = 619.33

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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.