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Finding the Fourth Proportional to 428.90, 591.86 and 242.38

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Solution

The fourth proportional to 428.90, 591.86 and 242.38 is: 334.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.90 : 591.86 = 242.38 : x
  2. Step 2: Convert to fraction form
    428.90/591.86 = 242.38/x
  3. Step 3: Cross multiply
    428.90x = 591.86 × 242.38
  4. Step 4: Simplify right side
    428.90x = 143,450.86
  5. Step 5: Solve for x
    x = 143,450.86/428.90
  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.