Home / 3,121.76-4,681.12-929.84

Finding the Fourth Proportional to 3,121.76, 4,681.12 and 929.84

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Solution

The fourth proportional to 3,121.76, 4,681.12 and 929.84 is: 1,394.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.76 : 4,681.12 = 929.84 : x
  2. Step 2: Convert to fraction form
    3,121.76/4,681.12 = 929.84/x
  3. Step 3: Cross multiply
    3,121.76x = 4,681.12 × 929.84
  4. Step 4: Simplify right side
    3,121.76x = 4,352,692.62
  5. Step 5: Solve for x
    x = 4,352,692.62/3,121.76
  6. Step 6: Final answer
    x = 1,394.31

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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.