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Finding the Fourth Proportional to 831.88, 1,245.65 and 485.38

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Solution

The fourth proportional to 831.88, 1,245.65 and 485.38 is: 726.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.88 : 1,245.65 = 485.38 : x
  2. Step 2: Convert to fraction form
    831.88/1,245.65 = 485.38/x
  3. Step 3: Cross multiply
    831.88x = 1,245.65 × 485.38
  4. Step 4: Simplify right side
    831.88x = 604,608.06
  5. Step 5: Solve for x
    x = 604,608.06/831.88
  6. Step 6: Final answer
    x = 726.80

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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.