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Finding the Fourth Proportional to 840.46, 1,259.79 and 450.19

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Solution

The fourth proportional to 840.46, 1,259.79 and 450.19 is: 674.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.46 : 1,259.79 = 450.19 : x
  2. Step 2: Convert to fraction form
    840.46/1,259.79 = 450.19/x
  3. Step 3: Cross multiply
    840.46x = 1,259.79 × 450.19
  4. Step 4: Simplify right side
    840.46x = 567,144.86
  5. Step 5: Solve for x
    x = 567,144.86/840.46
  6. Step 6: Final answer
    x = 674.80

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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.