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Finding the Fourth Proportional to 612.81, 845.15 and 487.53

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Solution

The fourth proportional to 612.81, 845.15 and 487.53 is: 672.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.81 : 845.15 = 487.53 : x
  2. Step 2: Convert to fraction form
    612.81/845.15 = 487.53/x
  3. Step 3: Cross multiply
    612.81x = 845.15 × 487.53
  4. Step 4: Simplify right side
    612.81x = 412,033.54
  5. Step 5: Solve for x
    x = 412,033.54/612.81
  6. Step 6: Final answer
    x = 672.37

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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.