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Finding the Fourth Proportional to 759.39, 1,139.16 and 297.21

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Solution

The fourth proportional to 759.39, 1,139.16 and 297.21 is: 445.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.39 : 1,139.16 = 297.21 : x
  2. Step 2: Convert to fraction form
    759.39/1,139.16 = 297.21/x
  3. Step 3: Cross multiply
    759.39x = 1,139.16 × 297.21
  4. Step 4: Simplify right side
    759.39x = 338,569.74
  5. Step 5: Solve for x
    x = 338,569.74/759.39
  6. Step 6: Final answer
    x = 445.84

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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.