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Finding the Fourth Proportional to 322.80, 483.90 and 127.68

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Solution

The fourth proportional to 322.80, 483.90 and 127.68 is: 191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.80 : 483.90 = 127.68 : x
  2. Step 2: Convert to fraction form
    322.80/483.90 = 127.68/x
  3. Step 3: Cross multiply
    322.80x = 483.90 × 127.68
  4. Step 4: Simplify right side
    322.80x = 61,784.35
  5. Step 5: Solve for x
    x = 61,784.35/322.80
  6. Step 6: Final answer
    x = 191.40

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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.