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Finding the Fourth Proportional to 753.62, 1,131.48 and 388.67

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Solution

The fourth proportional to 753.62, 1,131.48 and 388.67 is: 583.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.62 : 1,131.48 = 388.67 : x
  2. Step 2: Convert to fraction form
    753.62/1,131.48 = 388.67/x
  3. Step 3: Cross multiply
    753.62x = 1,131.48 × 388.67
  4. Step 4: Simplify right side
    753.62x = 439,772.33
  5. Step 5: Solve for x
    x = 439,772.33/753.62
  6. Step 6: Final answer
    x = 583.55

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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.