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Finding the Fourth Proportional to 759.10, 1,138.23 and 392.98

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Solution

The fourth proportional to 759.10, 1,138.23 and 392.98 is: 589.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.10 : 1,138.23 = 392.98 : x
  2. Step 2: Convert to fraction form
    759.10/1,138.23 = 392.98/x
  3. Step 3: Cross multiply
    759.10x = 1,138.23 × 392.98
  4. Step 4: Simplify right side
    759.10x = 447,301.63
  5. Step 5: Solve for x
    x = 447,301.63/759.10
  6. Step 6: Final answer
    x = 589.25

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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.