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Finding the Fourth Proportional to 489.38, 675.78 and 315.02

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Solution

The fourth proportional to 489.38, 675.78 and 315.02 is: 435.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.38 : 675.78 = 315.02 : x
  2. Step 2: Convert to fraction form
    489.38/675.78 = 315.02/x
  3. Step 3: Cross multiply
    489.38x = 675.78 × 315.02
  4. Step 4: Simplify right side
    489.38x = 212,880.84
  5. Step 5: Solve for x
    x = 212,880.84/489.38
  6. Step 6: Final answer
    x = 435.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.