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Finding the Fourth Proportional to 763.77, 1,145.05 and 330.63

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Solution

The fourth proportional to 763.77, 1,145.05 and 330.63 is: 495.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.77 : 1,145.05 = 330.63 : x
  2. Step 2: Convert to fraction form
    763.77/1,145.05 = 330.63/x
  3. Step 3: Cross multiply
    763.77x = 1,145.05 × 330.63
  4. Step 4: Simplify right side
    763.77x = 378,587.88
  5. Step 5: Solve for x
    x = 378,587.88/763.77
  6. Step 6: Final answer
    x = 495.68

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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.