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Finding the Fourth Proportional to 1,621.86, 2,432.31 and 928.41

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Solution

The fourth proportional to 1,621.86, 2,432.31 and 928.41 is: 1,392.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.86 : 2,432.31 = 928.41 : x
  2. Step 2: Convert to fraction form
    1,621.86/2,432.31 = 928.41/x
  3. Step 3: Cross multiply
    1,621.86x = 2,432.31 × 928.41
  4. Step 4: Simplify right side
    1,621.86x = 2,258,180.93
  5. Step 5: Solve for x
    x = 2,258,180.93/1,621.86
  6. Step 6: Final answer
    x = 1,392.34

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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.