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Finding the Fourth Proportional to 768.57, 1,151.16 and 438.75

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Solution

The fourth proportional to 768.57, 1,151.16 and 438.75 is: 657.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.57 : 1,151.16 = 438.75 : x
  2. Step 2: Convert to fraction form
    768.57/1,151.16 = 438.75/x
  3. Step 3: Cross multiply
    768.57x = 1,151.16 × 438.75
  4. Step 4: Simplify right side
    768.57x = 505,071.45
  5. Step 5: Solve for x
    x = 505,071.45/768.57
  6. Step 6: Final answer
    x = 657.16

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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.