Home / 1,946.75-2,920.13-485.90

Finding the Fourth Proportional to 1,946.75, 2,920.13 and 485.90

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Solution

The fourth proportional to 1,946.75, 2,920.13 and 485.90 is: 728.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.75 : 2,920.13 = 485.90 : x
  2. Step 2: Convert to fraction form
    1,946.75/2,920.13 = 485.90/x
  3. Step 3: Cross multiply
    1,946.75x = 2,920.13 × 485.90
  4. Step 4: Simplify right side
    1,946.75x = 1,418,891.17
  5. Step 5: Solve for x
    x = 1,418,891.17/1,946.75
  6. Step 6: Final answer
    x = 728.85

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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.