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Finding the Fourth Proportional to 1,120.30, 1,680.45 and 634.30

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Solution

The fourth proportional to 1,120.30, 1,680.45 and 634.30 is: 951.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.30 : 1,680.45 = 634.30 : x
  2. Step 2: Convert to fraction form
    1,120.30/1,680.45 = 634.30/x
  3. Step 3: Cross multiply
    1,120.30x = 1,680.45 × 634.30
  4. Step 4: Simplify right side
    1,120.30x = 1,065,909.44
  5. Step 5: Solve for x
    x = 1,065,909.44/1,120.30
  6. Step 6: Final answer
    x = 951.45

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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.