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Finding the Fourth Proportional to 345.69, 476.28 and 258.21

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Solution

The fourth proportional to 345.69, 476.28 and 258.21 is: 355.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.69 : 476.28 = 258.21 : x
  2. Step 2: Convert to fraction form
    345.69/476.28 = 258.21/x
  3. Step 3: Cross multiply
    345.69x = 476.28 × 258.21
  4. Step 4: Simplify right side
    345.69x = 122,980.26
  5. Step 5: Solve for x
    x = 122,980.26/345.69
  6. Step 6: Final answer
    x = 355.75

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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.