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Finding the Fourth Proportional to 345.60, 518.40 and 162.78

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Solution

The fourth proportional to 345.60, 518.40 and 162.78 is: 244.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.60 : 518.40 = 162.78 : x
  2. Step 2: Convert to fraction form
    345.60/518.40 = 162.78/x
  3. Step 3: Cross multiply
    345.60x = 518.40 × 162.78
  4. Step 4: Simplify right side
    345.60x = 84,385.15
  5. Step 5: Solve for x
    x = 84,385.15/345.60
  6. Step 6: Final answer
    x = 244.17

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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.