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Finding the Fourth Proportional to 387.43, 534.30 and 347.67

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Solution

The fourth proportional to 387.43, 534.30 and 347.67 is: 479.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.43 : 534.30 = 347.67 : x
  2. Step 2: Convert to fraction form
    387.43/534.30 = 347.67/x
  3. Step 3: Cross multiply
    387.43x = 534.30 × 347.67
  4. Step 4: Simplify right side
    387.43x = 185,757.27
  5. Step 5: Solve for x
    x = 185,757.27/387.43
  6. Step 6: Final answer
    x = 479.46

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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.