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Finding the Fourth Proportional to 840.75, 1,261.20 and 224.45

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Solution

The fourth proportional to 840.75, 1,261.20 and 224.45 is: 336.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.75 : 1,261.20 = 224.45 : x
  2. Step 2: Convert to fraction form
    840.75/1,261.20 = 224.45/x
  3. Step 3: Cross multiply
    840.75x = 1,261.20 × 224.45
  4. Step 4: Simplify right side
    840.75x = 283,075.22
  5. Step 5: Solve for x
    x = 283,075.22/840.75
  6. Step 6: Final answer
    x = 336.70

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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.