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Finding the Fourth Proportional to 291.72, 402.21 and 242.58

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Solution

The fourth proportional to 291.72, 402.21 and 242.58 is: 334.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.72 : 402.21 = 242.58 : x
  2. Step 2: Convert to fraction form
    291.72/402.21 = 242.58/x
  3. Step 3: Cross multiply
    291.72x = 402.21 × 242.58
  4. Step 4: Simplify right side
    291.72x = 97,568.10
  5. Step 5: Solve for x
    x = 97,568.10/291.72
  6. Step 6: Final answer
    x = 334.46

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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.