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Finding the Fourth Proportional to 643.12, 962.72 and 584.80

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Solution

The fourth proportional to 643.12, 962.72 and 584.80 is: 875.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.12 : 962.72 = 584.80 : x
  2. Step 2: Convert to fraction form
    643.12/962.72 = 584.80/x
  3. Step 3: Cross multiply
    643.12x = 962.72 × 584.80
  4. Step 4: Simplify right side
    643.12x = 562,998.66
  5. Step 5: Solve for x
    x = 562,998.66/643.12
  6. Step 6: Final answer
    x = 875.42

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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.