Home / 3,121.10-4,681.33-929.85

Finding the Fourth Proportional to 3,121.10, 4,681.33 and 929.85

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Solution

The fourth proportional to 3,121.10, 4,681.33 and 929.85 is: 1,394.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.10 : 4,681.33 = 929.85 : x
  2. Step 2: Convert to fraction form
    3,121.10/4,681.33 = 929.85/x
  3. Step 3: Cross multiply
    3,121.10x = 4,681.33 × 929.85
  4. Step 4: Simplify right side
    3,121.10x = 4,352,914.82
  5. Step 5: Solve for x
    x = 4,352,914.82/3,121.10
  6. Step 6: Final answer
    x = 1,394.67

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1.5x scale

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.