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Finding the Fourth Proportional to 483.94, 666.30 and 421.66

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Solution

The fourth proportional to 483.94, 666.30 and 421.66 is: 580.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.94 : 666.30 = 421.66 : x
  2. Step 2: Convert to fraction form
    483.94/666.30 = 421.66/x
  3. Step 3: Cross multiply
    483.94x = 666.30 × 421.66
  4. Step 4: Simplify right side
    483.94x = 280,952.06
  5. Step 5: Solve for x
    x = 280,952.06/483.94
  6. Step 6: Final answer
    x = 580.55

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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.