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Finding the Fourth Proportional to 342.46, 515.62 and 312.64

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Solution

The fourth proportional to 342.46, 515.62 and 312.64 is: 470.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.46 : 515.62 = 312.64 : x
  2. Step 2: Convert to fraction form
    342.46/515.62 = 312.64/x
  3. Step 3: Cross multiply
    342.46x = 515.62 × 312.64
  4. Step 4: Simplify right side
    342.46x = 161,203.44
  5. Step 5: Solve for x
    x = 161,203.44/342.46
  6. Step 6: Final answer
    x = 470.72

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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.