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Finding the Fourth Proportional to 345.90, 521.22 and 286.36

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Solution

The fourth proportional to 345.90, 521.22 and 286.36 is: 431.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.90 : 521.22 = 286.36 : x
  2. Step 2: Convert to fraction form
    345.90/521.22 = 286.36/x
  3. Step 3: Cross multiply
    345.90x = 521.22 × 286.36
  4. Step 4: Simplify right side
    345.90x = 149,256.56
  5. Step 5: Solve for x
    x = 149,256.56/345.90
  6. Step 6: Final answer
    x = 431.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.