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Finding the Fourth Proportional to 643.75, 964.61 and 383.13

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Solution

The fourth proportional to 643.75, 964.61 and 383.13 is: 574.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.75 : 964.61 = 383.13 : x
  2. Step 2: Convert to fraction form
    643.75/964.61 = 383.13/x
  3. Step 3: Cross multiply
    643.75x = 964.61 × 383.13
  4. Step 4: Simplify right side
    643.75x = 369,570.55
  5. Step 5: Solve for x
    x = 369,570.55/643.75
  6. Step 6: Final answer
    x = 574.09

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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.