Home / 1,442.80-2,161.32-928.72

Finding the Fourth Proportional to 1,442.80, 2,161.32 and 928.72

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Solution

The fourth proportional to 1,442.80, 2,161.32 and 928.72 is: 1,391.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.80 : 2,161.32 = 928.72 : x
  2. Step 2: Convert to fraction form
    1,442.80/2,161.32 = 928.72/x
  3. Step 3: Cross multiply
    1,442.80x = 2,161.32 × 928.72
  4. Step 4: Simplify right side
    1,442.80x = 2,007,261.11
  5. Step 5: Solve for x
    x = 2,007,261.11/1,442.80
  6. Step 6: Final answer
    x = 1,391.23

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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.