Home / 3,121.37-4,681.75-929.91

Finding the Fourth Proportional to 3,121.37, 4,681.75 and 929.91

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Solution

The fourth proportional to 3,121.37, 4,681.75 and 929.91 is: 1,394.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.37 : 4,681.75 = 929.91 : x
  2. Step 2: Convert to fraction form
    3,121.37/4,681.75 = 929.91/x
  3. Step 3: Cross multiply
    3,121.37x = 4,681.75 × 929.91
  4. Step 4: Simplify right side
    3,121.37x = 4,353,606.14
  5. Step 5: Solve for x
    x = 4,353,606.14/3,121.37
  6. Step 6: Final answer
    x = 1,394.77

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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.