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Finding the Fourth Proportional to 740.20, 1,021.26 and 445.64

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Solution

The fourth proportional to 740.20, 1,021.26 and 445.64 is: 614.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.20 : 1,021.26 = 445.64 : x
  2. Step 2: Convert to fraction form
    740.20/1,021.26 = 445.64/x
  3. Step 3: Cross multiply
    740.20x = 1,021.26 × 445.64
  4. Step 4: Simplify right side
    740.20x = 455,114.31
  5. Step 5: Solve for x
    x = 455,114.31/740.20
  6. Step 6: Final answer
    x = 614.85

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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.