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Finding the Fourth Proportional to 612.81, 843.81 and 480.57

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Solution

The fourth proportional to 612.81, 843.81 and 480.57 is: 661.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.81 : 843.81 = 480.57 : x
  2. Step 2: Convert to fraction form
    612.81/843.81 = 480.57/x
  3. Step 3: Cross multiply
    612.81x = 843.81 × 480.57
  4. Step 4: Simplify right side
    612.81x = 405,509.77
  5. Step 5: Solve for x
    x = 405,509.77/612.81
  6. Step 6: Final answer
    x = 661.72

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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.