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Finding the Fourth Proportional to 428.70, 591.56 and 242.15

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Solution

The fourth proportional to 428.70, 591.56 and 242.15 is: 334.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.70 : 591.56 = 242.15 : x
  2. Step 2: Convert to fraction form
    428.70/591.56 = 242.15/x
  3. Step 3: Cross multiply
    428.70x = 591.56 × 242.15
  4. Step 4: Simplify right side
    428.70x = 143,246.25
  5. Step 5: Solve for x
    x = 143,246.25/428.70
  6. Step 6: Final answer
    x = 334.14

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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.