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Finding the Fourth Proportional to 758.62, 1,136.16 and 393.70

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Solution

The fourth proportional to 758.62, 1,136.16 and 393.70 is: 589.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.62 : 1,136.16 = 393.70 : x
  2. Step 2: Convert to fraction form
    758.62/1,136.16 = 393.70/x
  3. Step 3: Cross multiply
    758.62x = 1,136.16 × 393.70
  4. Step 4: Simplify right side
    758.62x = 447,306.19
  5. Step 5: Solve for x
    x = 447,306.19/758.62
  6. Step 6: Final answer
    x = 589.63

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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.