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Finding the Fourth Proportional to 388.89, 535.68 and 326.72

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Solution

The fourth proportional to 388.89, 535.68 and 326.72 is: 450.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.89 : 535.68 = 326.72 : x
  2. Step 2: Convert to fraction form
    388.89/535.68 = 326.72/x
  3. Step 3: Cross multiply
    388.89x = 535.68 × 326.72
  4. Step 4: Simplify right side
    388.89x = 175,018.71
  5. Step 5: Solve for x
    x = 175,018.71/388.89
  6. Step 6: Final answer
    x = 450.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.