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Finding the Fourth Proportional to 642, 962.88 and 316.80

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Solution

The fourth proportional to 642, 962.88 and 316.80 is: 475.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 962.88 = 316.80 : x
  2. Step 2: Convert to fraction form
    642/962.88 = 316.80/x
  3. Step 3: Cross multiply
    642x = 962.88 × 316.80
  4. Step 4: Simplify right side
    642x = 305,040.38
  5. Step 5: Solve for x
    x = 305,040.38/642
  6. Step 6: Final answer
    x = 475.14

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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.