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Finding the Fourth Proportional to 388.96, 536.26 and 318.76

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Solution

The fourth proportional to 388.96, 536.26 and 318.76 is: 439.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.96 : 536.26 = 318.76 : x
  2. Step 2: Convert to fraction form
    388.96/536.26 = 318.76/x
  3. Step 3: Cross multiply
    388.96x = 536.26 × 318.76
  4. Step 4: Simplify right side
    388.96x = 170,938.24
  5. Step 5: Solve for x
    x = 170,938.24/388.96
  6. Step 6: Final answer
    x = 439.48

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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.