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Finding the Fourth Proportional to 825.21, 1,139.05 and 545.69

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Solution

The fourth proportional to 825.21, 1,139.05 and 545.69 is: 753.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.21 : 1,139.05 = 545.69 : x
  2. Step 2: Convert to fraction form
    825.21/1,139.05 = 545.69/x
  3. Step 3: Cross multiply
    825.21x = 1,139.05 × 545.69
  4. Step 4: Simplify right side
    825.21x = 621,568.19
  5. Step 5: Solve for x
    x = 621,568.19/825.21
  6. Step 6: Final answer
    x = 753.23

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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.