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Finding the Fourth Proportional to 342.88, 473.10 and 255.40

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Solution

The fourth proportional to 342.88, 473.10 and 255.40 is: 352.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.88 : 473.10 = 255.40 : x
  2. Step 2: Convert to fraction form
    342.88/473.10 = 255.40/x
  3. Step 3: Cross multiply
    342.88x = 473.10 × 255.40
  4. Step 4: Simplify right side
    342.88x = 120,829.74
  5. Step 5: Solve for x
    x = 120,829.74/342.88
  6. Step 6: Final answer
    x = 352.40

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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.