Home / 3,120.24-4,681.08-1,389

Finding the Fourth Proportional to 3,120.24, 4,681.08 and 1,389

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Solution

The fourth proportional to 3,120.24, 4,681.08 and 1,389 is: 2,083.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.24 : 4,681.08 = 1,389 : x
  2. Step 2: Convert to fraction form
    3,120.24/4,681.08 = 1,389/x
  3. Step 3: Cross multiply
    3,120.24x = 4,681.08 × 1,389
  4. Step 4: Simplify right side
    3,120.24x = 6,502,020.12
  5. Step 5: Solve for x
    x = 6,502,020.12/3,120.24
  6. Step 6: Final answer
    x = 2,083.82

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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.