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Finding the Fourth Proportional to 758.50, 1,138.10 and 393.09

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Solution

The fourth proportional to 758.50, 1,138.10 and 393.09 is: 589.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.50 : 1,138.10 = 393.09 : x
  2. Step 2: Convert to fraction form
    758.50/1,138.10 = 393.09/x
  3. Step 3: Cross multiply
    758.50x = 1,138.10 × 393.09
  4. Step 4: Simplify right side
    758.50x = 447,376.71
  5. Step 5: Solve for x
    x = 447,376.71/758.50
  6. Step 6: Final answer
    x = 589.82

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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.