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Finding the Fourth Proportional to 763.80, 1,145.70 and 756.60

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Solution

The fourth proportional to 763.80, 1,145.70 and 756.60 is: 1,134.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.80 : 1,145.70 = 756.60 : x
  2. Step 2: Convert to fraction form
    763.80/1,145.70 = 756.60/x
  3. Step 3: Cross multiply
    763.80x = 1,145.70 × 756.60
  4. Step 4: Simplify right side
    763.80x = 866,836.62
  5. Step 5: Solve for x
    x = 866,836.62/763.80
  6. Step 6: Final answer
    x = 1,134.90

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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.