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Finding the Fourth Proportional to 340.77, 469.89 and 257.61

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Solution

The fourth proportional to 340.77, 469.89 and 257.61 is: 355.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.77 : 469.89 = 257.61 : x
  2. Step 2: Convert to fraction form
    340.77/469.89 = 257.61/x
  3. Step 3: Cross multiply
    340.77x = 469.89 × 257.61
  4. Step 4: Simplify right side
    340.77x = 121,048.36
  5. Step 5: Solve for x
    x = 121,048.36/340.77
  6. Step 6: Final answer
    x = 355.22

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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.