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Finding the Fourth Proportional to 554.90, 831.54 and 311.50

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Solution

The fourth proportional to 554.90, 831.54 and 311.50 is: 466.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.90 : 831.54 = 311.50 : x
  2. Step 2: Convert to fraction form
    554.90/831.54 = 311.50/x
  3. Step 3: Cross multiply
    554.90x = 831.54 × 311.50
  4. Step 4: Simplify right side
    554.90x = 259,020.55
  5. Step 5: Solve for x
    x = 259,020.55/554.90
  6. Step 6: Final answer
    x = 466.79

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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.