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Finding the Fourth Proportional to 340.90, 470.48 and 285.54

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Solution

The fourth proportional to 340.90, 470.48 and 285.54 is: 394.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.90 : 470.48 = 285.54 : x
  2. Step 2: Convert to fraction form
    340.90/470.48 = 285.54/x
  3. Step 3: Cross multiply
    340.90x = 470.48 × 285.54
  4. Step 4: Simplify right side
    340.90x = 134,340.86
  5. Step 5: Solve for x
    x = 134,340.86/340.90
  6. Step 6: Final answer
    x = 394.08

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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.