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Finding the Fourth Proportional to 763.30, 1,052.82 and 479.80

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Solution

The fourth proportional to 763.30, 1,052.82 and 479.80 is: 661.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.30 : 1,052.82 = 479.80 : x
  2. Step 2: Convert to fraction form
    763.30/1,052.82 = 479.80/x
  3. Step 3: Cross multiply
    763.30x = 1,052.82 × 479.80
  4. Step 4: Simplify right side
    763.30x = 505,143.04
  5. Step 5: Solve for x
    x = 505,143.04/763.30
  6. Step 6: Final answer
    x = 661.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.