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Finding the Fourth Proportional to 1,432.40, 1,976.60 and 842.85

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Solution

The fourth proportional to 1,432.40, 1,976.60 and 842.85 is: 1,163.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.40 : 1,976.60 = 842.85 : x
  2. Step 2: Convert to fraction form
    1,432.40/1,976.60 = 842.85/x
  3. Step 3: Cross multiply
    1,432.40x = 1,976.60 × 842.85
  4. Step 4: Simplify right side
    1,432.40x = 1,665,979.42
  5. Step 5: Solve for x
    x = 1,665,979.42/1,432.40
  6. Step 6: Final answer
    x = 1,163.07

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1.5x scale

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.