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Finding the Fourth Proportional to 714.88, 1,072.80 and 330.16

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Solution

The fourth proportional to 714.88, 1,072.80 and 330.16 is: 495.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.88 : 1,072.80 = 330.16 : x
  2. Step 2: Convert to fraction form
    714.88/1,072.80 = 330.16/x
  3. Step 3: Cross multiply
    714.88x = 1,072.80 × 330.16
  4. Step 4: Simplify right side
    714.88x = 354,195.65
  5. Step 5: Solve for x
    x = 354,195.65/714.88
  6. Step 6: Final answer
    x = 495.46

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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.