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Finding the Fourth Proportional to 620.40, 930.90 and 474.10

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Solution

The fourth proportional to 620.40, 930.90 and 474.10 is: 711.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.40 : 930.90 = 474.10 : x
  2. Step 2: Convert to fraction form
    620.40/930.90 = 474.10/x
  3. Step 3: Cross multiply
    620.40x = 930.90 × 474.10
  4. Step 4: Simplify right side
    620.40x = 441,339.69
  5. Step 5: Solve for x
    x = 441,339.69/620.40
  6. Step 6: Final answer
    x = 711.38

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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.