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Finding the Fourth Proportional to 390.84, 539.32 and 225.02

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Solution

The fourth proportional to 390.84, 539.32 and 225.02 is: 310.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.84 : 539.32 = 225.02 : x
  2. Step 2: Convert to fraction form
    390.84/539.32 = 225.02/x
  3. Step 3: Cross multiply
    390.84x = 539.32 × 225.02
  4. Step 4: Simplify right side
    390.84x = 121,357.79
  5. Step 5: Solve for x
    x = 121,357.79/390.84
  6. Step 6: Final answer
    x = 310.51

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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.