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Finding the Fourth Proportional to 612.20, 842.28 and 480.92

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Solution

The fourth proportional to 612.20, 842.28 and 480.92 is: 661.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.20 : 842.28 = 480.92 : x
  2. Step 2: Convert to fraction form
    612.20/842.28 = 480.92/x
  3. Step 3: Cross multiply
    612.20x = 842.28 × 480.92
  4. Step 4: Simplify right side
    612.20x = 405,069.30
  5. Step 5: Solve for x
    x = 405,069.30/612.20
  6. Step 6: Final answer
    x = 661.66

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1.5x scale

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.