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Finding the Fourth Proportional to 428.74, 591.62 and 242.18

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Solution

The fourth proportional to 428.74, 591.62 and 242.18 is: 334.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.74 : 591.62 = 242.18 : x
  2. Step 2: Convert to fraction form
    428.74/591.62 = 242.18/x
  3. Step 3: Cross multiply
    428.74x = 591.62 × 242.18
  4. Step 4: Simplify right side
    428.74x = 143,280.62
  5. Step 5: Solve for x
    x = 143,280.62/428.74
  6. Step 6: Final answer
    x = 334.19

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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.