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Finding the Fourth Proportional to 445.56, 614.37 and 390.27

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Solution

The fourth proportional to 445.56, 614.37 and 390.27 is: 538.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.56 : 614.37 = 390.27 : x
  2. Step 2: Convert to fraction form
    445.56/614.37 = 390.27/x
  3. Step 3: Cross multiply
    445.56x = 614.37 × 390.27
  4. Step 4: Simplify right side
    445.56x = 239,770.18
  5. Step 5: Solve for x
    x = 239,770.18/445.56
  6. Step 6: Final answer
    x = 538.13

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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.