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Finding the Fourth Proportional to 478.45, 660.30 and 404.67

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Solution

The fourth proportional to 478.45, 660.30 and 404.67 is: 558.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.45 : 660.30 = 404.67 : x
  2. Step 2: Convert to fraction form
    478.45/660.30 = 404.67/x
  3. Step 3: Cross multiply
    478.45x = 660.30 × 404.67
  4. Step 4: Simplify right side
    478.45x = 267,203.60
  5. Step 5: Solve for x
    x = 267,203.60/478.45
  6. Step 6: Final answer
    x = 558.48

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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.