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Finding the Fourth Proportional to 345.71, 518.52 and 89.21

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Solution

The fourth proportional to 345.71, 518.52 and 89.21 is: 133.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.71 : 518.52 = 89.21 : x
  2. Step 2: Convert to fraction form
    345.71/518.52 = 89.21/x
  3. Step 3: Cross multiply
    345.71x = 518.52 × 89.21
  4. Step 4: Simplify right side
    345.71x = 46,257.17
  5. Step 5: Solve for x
    x = 46,257.17/345.71
  6. Step 6: Final answer
    x = 133.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.