Home / 1,215.02-1,821.36-392.74

Finding the Fourth Proportional to 1,215.02, 1,821.36 and 392.74

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Solution

The fourth proportional to 1,215.02, 1,821.36 and 392.74 is: 588.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.02 : 1,821.36 = 392.74 : x
  2. Step 2: Convert to fraction form
    1,215.02/1,821.36 = 392.74/x
  3. Step 3: Cross multiply
    1,215.02x = 1,821.36 × 392.74
  4. Step 4: Simplify right side
    1,215.02x = 715,316.37
  5. Step 5: Solve for x
    x = 715,316.37/1,215.02
  6. Step 6: Final answer
    x = 588.73

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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.