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Finding the Fourth Proportional to 489.84, 675.93 and 315

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Solution

The fourth proportional to 489.84, 675.93 and 315 is: 434.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.84 : 675.93 = 315 : x
  2. Step 2: Convert to fraction form
    489.84/675.93 = 315/x
  3. Step 3: Cross multiply
    489.84x = 675.93 × 315
  4. Step 4: Simplify right side
    489.84x = 212,917.95
  5. Step 5: Solve for x
    x = 212,917.95/489.84
  6. Step 6: Final answer
    x = 434.67

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