Home / 1,215.04-1,821.28-445.12

Finding the Fourth Proportional to 1,215.04, 1,821.28 and 445.12

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Solution

The fourth proportional to 1,215.04, 1,821.28 and 445.12 is: 667.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.04 : 1,821.28 = 445.12 : x
  2. Step 2: Convert to fraction form
    1,215.04/1,821.28 = 445.12/x
  3. Step 3: Cross multiply
    1,215.04x = 1,821.28 × 445.12
  4. Step 4: Simplify right side
    1,215.04x = 810,688.15
  5. Step 5: Solve for x
    x = 810,688.15/1,215.04
  6. Step 6: Final answer
    x = 667.21

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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.