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Finding the Fourth Proportional to 611.62, 842.40 and 480.40

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Solution

The fourth proportional to 611.62, 842.40 and 480.40 is: 661.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.62 : 842.40 = 480.40 : x
  2. Step 2: Convert to fraction form
    611.62/842.40 = 480.40/x
  3. Step 3: Cross multiply
    611.62x = 842.40 × 480.40
  4. Step 4: Simplify right side
    611.62x = 404,686.85
  5. Step 5: Solve for x
    x = 404,686.85/611.62
  6. Step 6: Final answer
    x = 661.67

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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.