Home / 1,215.30-1,822.85-485.04

Finding the Fourth Proportional to 1,215.30, 1,822.85 and 485.04

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Solution

The fourth proportional to 1,215.30, 1,822.85 and 485.04 is: 727.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.30 : 1,822.85 = 485.04 : x
  2. Step 2: Convert to fraction form
    1,215.30/1,822.85 = 485.04/x
  3. Step 3: Cross multiply
    1,215.30x = 1,822.85 × 485.04
  4. Step 4: Simplify right side
    1,215.30x = 884,146.05
  5. Step 5: Solve for x
    x = 884,146.05/1,215.30
  6. Step 6: Final answer
    x = 727.52

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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.