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Finding the Fourth Proportional to 763.40, 1,145.10 and 544.70

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Solution

The fourth proportional to 763.40, 1,145.10 and 544.70 is: 817.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.40 : 1,145.10 = 544.70 : x
  2. Step 2: Convert to fraction form
    763.40/1,145.10 = 544.70/x
  3. Step 3: Cross multiply
    763.40x = 1,145.10 × 544.70
  4. Step 4: Simplify right side
    763.40x = 623,735.97
  5. Step 5: Solve for x
    x = 623,735.97/763.40
  6. Step 6: Final answer
    x = 817.05

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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.