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Finding the Fourth Proportional to 329.66, 455.54 and 313.64

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Solution

The fourth proportional to 329.66, 455.54 and 313.64 is: 433.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    329.66 : 455.54 = 313.64 : x
  2. Step 2: Convert to fraction form
    329.66/455.54 = 313.64/x
  3. Step 3: Cross multiply
    329.66x = 455.54 × 313.64
  4. Step 4: Simplify right side
    329.66x = 142,875.99
  5. Step 5: Solve for x
    x = 142,875.99/329.66
  6. Step 6: Final answer
    x = 433.40

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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.