Home / 1,215.63-1,823.45-485.39

Finding the Fourth Proportional to 1,215.63, 1,823.45 and 485.39

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Solution

The fourth proportional to 1,215.63, 1,823.45 and 485.39 is: 728.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.63 : 1,823.45 = 485.39 : x
  2. Step 2: Convert to fraction form
    1,215.63/1,823.45 = 485.39/x
  3. Step 3: Cross multiply
    1,215.63x = 1,823.45 × 485.39
  4. Step 4: Simplify right side
    1,215.63x = 885,072.85
  5. Step 5: Solve for x
    x = 885,072.85/1,215.63
  6. Step 6: Final answer
    x = 728.08

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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.