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Finding the Fourth Proportional to 340, 469.20 and 223.60

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Solution

The fourth proportional to 340, 469.20 and 223.60 is: 308.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    340 : 469.20 = 223.60 : x
  2. Step 2: Convert to fraction form
    340/469.20 = 223.60/x
  3. Step 3: Cross multiply
    340x = 469.20 × 223.60
  4. Step 4: Simplify right side
    340x = 104,913.12
  5. Step 5: Solve for x
    x = 104,913.12/340
  6. Step 6: Final answer
    x = 308.57

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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.