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Finding the Fourth Proportional to 768.31, 1,152.88 and 357.35

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Solution

The fourth proportional to 768.31, 1,152.88 and 357.35 is: 536.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.31 : 1,152.88 = 357.35 : x
  2. Step 2: Convert to fraction form
    768.31/1,152.88 = 357.35/x
  3. Step 3: Cross multiply
    768.31x = 1,152.88 × 357.35
  4. Step 4: Simplify right side
    768.31x = 411,975.01
  5. Step 5: Solve for x
    x = 411,975.01/768.31
  6. Step 6: Final answer
    x = 536.21

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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.