Home / 1,213.90-1,821.16-392.16

Finding the Fourth Proportional to 1,213.90, 1,821.16 and 392.16

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Solution

The fourth proportional to 1,213.90, 1,821.16 and 392.16 is: 588.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.90 : 1,821.16 = 392.16 : x
  2. Step 2: Convert to fraction form
    1,213.90/1,821.16 = 392.16/x
  3. Step 3: Cross multiply
    1,213.90x = 1,821.16 × 392.16
  4. Step 4: Simplify right side
    1,213.90x = 714,186.11
  5. Step 5: Solve for x
    x = 714,186.11/1,213.90
  6. Step 6: Final answer
    x = 588.34

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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.