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Finding the Fourth Proportional to 390.49, 539.05 and 266.51

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Solution

The fourth proportional to 390.49, 539.05 and 266.51 is: 367.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.49 : 539.05 = 266.51 : x
  2. Step 2: Convert to fraction form
    390.49/539.05 = 266.51/x
  3. Step 3: Cross multiply
    390.49x = 539.05 × 266.51
  4. Step 4: Simplify right side
    390.49x = 143,662.22
  5. Step 5: Solve for x
    x = 143,662.22/390.49
  6. Step 6: Final answer
    x = 367.90

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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.