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Finding the Fourth Proportional to 389.32, 536.70 and 342.88

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Solution

The fourth proportional to 389.32, 536.70 and 342.88 is: 472.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.32 : 536.70 = 342.88 : x
  2. Step 2: Convert to fraction form
    389.32/536.70 = 342.88/x
  3. Step 3: Cross multiply
    389.32x = 536.70 × 342.88
  4. Step 4: Simplify right side
    389.32x = 184,023.70
  5. Step 5: Solve for x
    x = 184,023.70/389.32
  6. Step 6: Final answer
    x = 472.68

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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.