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Finding the Fourth Proportional to 340.58, 470.63 and 257.55

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Solution

The fourth proportional to 340.58, 470.63 and 257.55 is: 355.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.58 : 470.63 = 257.55 : x
  2. Step 2: Convert to fraction form
    340.58/470.63 = 257.55/x
  3. Step 3: Cross multiply
    340.58x = 470.63 × 257.55
  4. Step 4: Simplify right side
    340.58x = 121,209.64
  5. Step 5: Solve for x
    x = 121,209.64/340.58
  6. Step 6: Final answer
    x = 355.89

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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.