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Finding the Fourth Proportional to 621.50, 930.90 and 404.42

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Solution

The fourth proportional to 621.50, 930.90 and 404.42 is: 605.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.50 : 930.90 = 404.42 : x
  2. Step 2: Convert to fraction form
    621.50/930.90 = 404.42/x
  3. Step 3: Cross multiply
    621.50x = 930.90 × 404.42
  4. Step 4: Simplify right side
    621.50x = 376,478.42
  5. Step 5: Solve for x
    x = 376,478.42/621.50
  6. Step 6: Final answer
    x = 605.76

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1.5x scale

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.