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Finding the Fourth Proportional to 482.78, 666.16 and 305.77

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Solution

The fourth proportional to 482.78, 666.16 and 305.77 is: 421.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.78 : 666.16 = 305.77 : x
  2. Step 2: Convert to fraction form
    482.78/666.16 = 305.77/x
  3. Step 3: Cross multiply
    482.78x = 666.16 × 305.77
  4. Step 4: Simplify right side
    482.78x = 203,691.74
  5. Step 5: Solve for x
    x = 203,691.74/482.78
  6. Step 6: Final answer
    x = 421.91

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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.