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Finding the Fourth Proportional to 478.12, 660.66 and 380.68

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Solution

The fourth proportional to 478.12, 660.66 and 380.68 is: 526.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.12 : 660.66 = 380.68 : x
  2. Step 2: Convert to fraction form
    478.12/660.66 = 380.68/x
  3. Step 3: Cross multiply
    478.12x = 660.66 × 380.68
  4. Step 4: Simplify right side
    478.12x = 251,500.05
  5. Step 5: Solve for x
    x = 251,500.05/478.12
  6. Step 6: Final answer
    x = 526.02

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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.