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Finding the Fourth Proportional to 641.91, 962.94 and 312.62

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Solution

The fourth proportional to 641.91, 962.94 and 312.62 is: 468.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.91 : 962.94 = 312.62 : x
  2. Step 2: Convert to fraction form
    641.91/962.94 = 312.62/x
  3. Step 3: Cross multiply
    641.91x = 962.94 × 312.62
  4. Step 4: Simplify right side
    641.91x = 301,030.82
  5. Step 5: Solve for x
    x = 301,030.82/641.91
  6. Step 6: Final answer
    x = 468.96

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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.