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Finding the Fourth Proportional to 740.25, 1,021.53 and 408.67

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Solution

The fourth proportional to 740.25, 1,021.53 and 408.67 is: 563.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.25 : 1,021.53 = 408.67 : x
  2. Step 2: Convert to fraction form
    740.25/1,021.53 = 408.67/x
  3. Step 3: Cross multiply
    740.25x = 1,021.53 × 408.67
  4. Step 4: Simplify right side
    740.25x = 417,466.62
  5. Step 5: Solve for x
    x = 417,466.62/740.25
  6. Step 6: Final answer
    x = 563.95

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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.