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Finding the Fourth Proportional to 428.93, 591.74 and 281.31

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Solution

The fourth proportional to 428.93, 591.74 and 281.31 is: 388.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.93 : 591.74 = 281.31 : x
  2. Step 2: Convert to fraction form
    428.93/591.74 = 281.31/x
  3. Step 3: Cross multiply
    428.93x = 591.74 × 281.31
  4. Step 4: Simplify right side
    428.93x = 166,459.81
  5. Step 5: Solve for x
    x = 166,459.81/428.93
  6. Step 6: Final answer
    x = 388.08

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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.