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Finding the Fourth Proportional to 620.81, 930.42 and 474.02

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Solution

The fourth proportional to 620.81, 930.42 and 474.02 is: 710.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.81 : 930.42 = 474.02 : x
  2. Step 2: Convert to fraction form
    620.81/930.42 = 474.02/x
  3. Step 3: Cross multiply
    620.81x = 930.42 × 474.02
  4. Step 4: Simplify right side
    620.81x = 441,040.01
  5. Step 5: Solve for x
    x = 441,040.01/620.81
  6. Step 6: Final answer
    x = 710.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.