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Finding the Fourth Proportional to 1,202.50, 1,659.21 and 678.43

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Solution

The fourth proportional to 1,202.50, 1,659.21 and 678.43 is: 936.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,202.50 : 1,659.21 = 678.43 : x
  2. Step 2: Convert to fraction form
    1,202.50/1,659.21 = 678.43/x
  3. Step 3: Cross multiply
    1,202.50x = 1,659.21 × 678.43
  4. Step 4: Simplify right side
    1,202.50x = 1,125,649.95
  5. Step 5: Solve for x
    x = 1,125,649.95/1,202.50
  6. Step 6: Final answer
    x = 936.09

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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.