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Finding the Fourth Proportional to 759.45, 1,139.17 and 547.58

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Solution

The fourth proportional to 759.45, 1,139.17 and 547.58 is: 821.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.45 : 1,139.17 = 547.58 : x
  2. Step 2: Convert to fraction form
    759.45/1,139.17 = 547.58/x
  3. Step 3: Cross multiply
    759.45x = 1,139.17 × 547.58
  4. Step 4: Simplify right side
    759.45x = 623,790.24
  5. Step 5: Solve for x
    x = 623,790.24/759.45
  6. Step 6: Final answer
    x = 821.38

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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.