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Finding the Fourth Proportional to 767.36, 1,152.24 and 643.82

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Solution

The fourth proportional to 767.36, 1,152.24 and 643.82 is: 966.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.36 : 1,152.24 = 643.82 : x
  2. Step 2: Convert to fraction form
    767.36/1,152.24 = 643.82/x
  3. Step 3: Cross multiply
    767.36x = 1,152.24 × 643.82
  4. Step 4: Simplify right side
    767.36x = 741,835.16
  5. Step 5: Solve for x
    x = 741,835.16/767.36
  6. Step 6: Final answer
    x = 966.74

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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.