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Finding the Fourth Proportional to 823.74, 1,235.16 and 432.81

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Solution

The fourth proportional to 823.74, 1,235.16 and 432.81 is: 648.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.74 : 1,235.16 = 432.81 : x
  2. Step 2: Convert to fraction form
    823.74/1,235.16 = 432.81/x
  3. Step 3: Cross multiply
    823.74x = 1,235.16 × 432.81
  4. Step 4: Simplify right side
    823.74x = 534,589.60
  5. Step 5: Solve for x
    x = 534,589.60/823.74
  6. Step 6: Final answer
    x = 648.98

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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.