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Finding the Fourth Proportional to 483.12, 666.56 and 308.72

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Solution

The fourth proportional to 483.12, 666.56 and 308.72 is: 425.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.12 : 666.56 = 308.72 : x
  2. Step 2: Convert to fraction form
    483.12/666.56 = 308.72/x
  3. Step 3: Cross multiply
    483.12x = 666.56 × 308.72
  4. Step 4: Simplify right side
    483.12x = 205,780.40
  5. Step 5: Solve for x
    x = 205,780.40/483.12
  6. Step 6: Final answer
    x = 425.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.