Home / 1,215.04-1,821.68-392.85

Finding the Fourth Proportional to 1,215.04, 1,821.68 and 392.85

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Solution

The fourth proportional to 1,215.04, 1,821.68 and 392.85 is: 588.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.04 : 1,821.68 = 392.85 : x
  2. Step 2: Convert to fraction form
    1,215.04/1,821.68 = 392.85/x
  3. Step 3: Cross multiply
    1,215.04x = 1,821.68 × 392.85
  4. Step 4: Simplify right side
    1,215.04x = 715,637.88
  5. Step 5: Solve for x
    x = 715,637.88/1,215.04
  6. Step 6: Final answer
    x = 588.98

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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.