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Finding the Fourth Proportional to 831.84, 1,245.72 and 484.08

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Solution

The fourth proportional to 831.84, 1,245.72 and 484.08 is: 724.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    831.84 : 1,245.72 = 484.08 : x
  2. Step 2: Convert to fraction form
    831.84/1,245.72 = 484.08/x
  3. Step 3: Cross multiply
    831.84x = 1,245.72 × 484.08
  4. Step 4: Simplify right side
    831.84x = 603,028.14
  5. Step 5: Solve for x
    x = 603,028.14/831.84
  6. Step 6: Final answer
    x = 724.93

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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.