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Finding the Fourth Proportional to 390.18, 537.91 and 271.99

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Solution

The fourth proportional to 390.18, 537.91 and 271.99 is: 374.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.18 : 537.91 = 271.99 : x
  2. Step 2: Convert to fraction form
    390.18/537.91 = 271.99/x
  3. Step 3: Cross multiply
    390.18x = 537.91 × 271.99
  4. Step 4: Simplify right side
    390.18x = 146,303.87
  5. Step 5: Solve for x
    x = 146,303.87/390.18
  6. Step 6: Final answer
    x = 374.96

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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.