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Finding the Fourth Proportional to 538.01, 742.86 and 390.99

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Solution

The fourth proportional to 538.01, 742.86 and 390.99 is: 539.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.01 : 742.86 = 390.99 : x
  2. Step 2: Convert to fraction form
    538.01/742.86 = 390.99/x
  3. Step 3: Cross multiply
    538.01x = 742.86 × 390.99
  4. Step 4: Simplify right side
    538.01x = 290,450.83
  5. Step 5: Solve for x
    x = 290,450.83/538.01
  6. Step 6: Final answer
    x = 539.87

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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.