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Finding the Fourth Proportional to 389.68, 538.08 and 242.56

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Solution

The fourth proportional to 389.68, 538.08 and 242.56 is: 334.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.68 : 538.08 = 242.56 : x
  2. Step 2: Convert to fraction form
    389.68/538.08 = 242.56/x
  3. Step 3: Cross multiply
    389.68x = 538.08 × 242.56
  4. Step 4: Simplify right side
    389.68x = 130,516.68
  5. Step 5: Solve for x
    x = 130,516.68/389.68
  6. Step 6: Final answer
    x = 334.93

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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.