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Finding the Fourth Proportional to 1,432.10, 1,976.19 and 842.60

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Solution

The fourth proportional to 1,432.10, 1,976.19 and 842.60 is: 1,162.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.10 : 1,976.19 = 842.60 : x
  2. Step 2: Convert to fraction form
    1,432.10/1,976.19 = 842.60/x
  3. Step 3: Cross multiply
    1,432.10x = 1,976.19 × 842.60
  4. Step 4: Simplify right side
    1,432.10x = 1,665,137.69
  5. Step 5: Solve for x
    x = 1,665,137.69/1,432.10
  6. Step 6: Final answer
    x = 1,162.72

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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.