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Finding the Fourth Proportional to 340.42, 469.28 and 257.62

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Solution

The fourth proportional to 340.42, 469.28 and 257.62 is: 355.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.42 : 469.28 = 257.62 : x
  2. Step 2: Convert to fraction form
    340.42/469.28 = 257.62/x
  3. Step 3: Cross multiply
    340.42x = 469.28 × 257.62
  4. Step 4: Simplify right side
    340.42x = 120,895.91
  5. Step 5: Solve for x
    x = 120,895.91/340.42
  6. Step 6: Final answer
    x = 355.14

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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.