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Finding the Fourth Proportional to 342.09, 515.70 and 318.60

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Solution

The fourth proportional to 342.09, 515.70 and 318.60 is: 480.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.09 : 515.70 = 318.60 : x
  2. Step 2: Convert to fraction form
    342.09/515.70 = 318.60/x
  3. Step 3: Cross multiply
    342.09x = 515.70 × 318.60
  4. Step 4: Simplify right side
    342.09x = 164,302.02
  5. Step 5: Solve for x
    x = 164,302.02/342.09
  6. Step 6: Final answer
    x = 480.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.