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Finding the Fourth Proportional to 390.72, 538.96 and 266.16

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Solution

The fourth proportional to 390.72, 538.96 and 266.16 is: 367.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.72 : 538.96 = 266.16 : x
  2. Step 2: Convert to fraction form
    390.72/538.96 = 266.16/x
  3. Step 3: Cross multiply
    390.72x = 538.96 × 266.16
  4. Step 4: Simplify right side
    390.72x = 143,449.59
  5. Step 5: Solve for x
    x = 143,449.59/390.72
  6. Step 6: Final answer
    x = 367.14

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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.