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Finding the Fourth Proportional to 389.48, 537.62 and 311.88

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Solution

The fourth proportional to 389.48, 537.62 and 311.88 is: 430.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.48 : 537.62 = 311.88 : x
  2. Step 2: Convert to fraction form
    389.48/537.62 = 311.88/x
  3. Step 3: Cross multiply
    389.48x = 537.62 × 311.88
  4. Step 4: Simplify right side
    389.48x = 167,672.93
  5. Step 5: Solve for x
    x = 167,672.93/389.48
  6. Step 6: Final answer
    x = 430.50

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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.