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Finding the Fourth Proportional to 346.12, 518.81 and 172.92

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Solution

The fourth proportional to 346.12, 518.81 and 172.92 is: 259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.12 : 518.81 = 172.92 : x
  2. Step 2: Convert to fraction form
    346.12/518.81 = 172.92/x
  3. Step 3: Cross multiply
    346.12x = 518.81 × 172.92
  4. Step 4: Simplify right side
    346.12x = 89,712.63
  5. Step 5: Solve for x
    x = 89,712.63/346.12
  6. Step 6: Final answer
    x = 259.20

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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.