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Finding the Fourth Proportional to 740.50, 1,021.94 and 445.78

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Solution

The fourth proportional to 740.50, 1,021.94 and 445.78 is: 615.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.50 : 1,021.94 = 445.78 : x
  2. Step 2: Convert to fraction form
    740.50/1,021.94 = 445.78/x
  3. Step 3: Cross multiply
    740.50x = 1,021.94 × 445.78
  4. Step 4: Simplify right side
    740.50x = 455,560.41
  5. Step 5: Solve for x
    x = 455,560.41/740.50
  6. Step 6: Final answer
    x = 615.21

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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.