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Finding the Fourth Proportional to 428.81, 591.78 and 242.25

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Solution

The fourth proportional to 428.81, 591.78 and 242.25 is: 334.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.81 : 591.78 = 242.25 : x
  2. Step 2: Convert to fraction form
    428.81/591.78 = 242.25/x
  3. Step 3: Cross multiply
    428.81x = 591.78 × 242.25
  4. Step 4: Simplify right side
    428.81x = 143,358.71
  5. Step 5: Solve for x
    x = 143,358.71/428.81
  6. Step 6: Final answer
    x = 334.32

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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.