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Finding the Fourth Proportional to 389.52, 538.56 and 302.88

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Solution

The fourth proportional to 389.52, 538.56 and 302.88 is: 418.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.52 : 538.56 = 302.88 : x
  2. Step 2: Convert to fraction form
    389.52/538.56 = 302.88/x
  3. Step 3: Cross multiply
    389.52x = 538.56 × 302.88
  4. Step 4: Simplify right side
    389.52x = 163,119.05
  5. Step 5: Solve for x
    x = 163,119.05/389.52
  6. Step 6: Final answer
    x = 418.77

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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.