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Finding the Fourth Proportional to 320.55, 479.65 and 277.72

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Solution

The fourth proportional to 320.55, 479.65 and 277.72 is: 415.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.55 : 479.65 = 277.72 : x
  2. Step 2: Convert to fraction form
    320.55/479.65 = 277.72/x
  3. Step 3: Cross multiply
    320.55x = 479.65 × 277.72
  4. Step 4: Simplify right side
    320.55x = 133,208.40
  5. Step 5: Solve for x
    x = 133,208.40/320.55
  6. Step 6: Final answer
    x = 415.56

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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.