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Finding the Fourth Proportional to 758.91, 1,138.74 and 393.99

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Solution

The fourth proportional to 758.91, 1,138.74 and 393.99 is: 591.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.91 : 1,138.74 = 393.99 : x
  2. Step 2: Convert to fraction form
    758.91/1,138.74 = 393.99/x
  3. Step 3: Cross multiply
    758.91x = 1,138.74 × 393.99
  4. Step 4: Simplify right side
    758.91x = 448,652.17
  5. Step 5: Solve for x
    x = 448,652.17/758.91
  6. Step 6: Final answer
    x = 591.18

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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.