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Finding the Fourth Proportional to 345.26, 476.28 and 279.65

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Solution

The fourth proportional to 345.26, 476.28 and 279.65 is: 385.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.26 : 476.28 = 279.65 : x
  2. Step 2: Convert to fraction form
    345.26/476.28 = 279.65/x
  3. Step 3: Cross multiply
    345.26x = 476.28 × 279.65
  4. Step 4: Simplify right side
    345.26x = 133,192.89
  5. Step 5: Solve for x
    x = 133,192.89/345.26
  6. Step 6: Final answer
    x = 385.77

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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.