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Finding the Fourth Proportional to 428.45, 592.02 and 391.10

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Solution

The fourth proportional to 428.45, 592.02 and 391.10 is: 540.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.45 : 592.02 = 391.10 : x
  2. Step 2: Convert to fraction form
    428.45/592.02 = 391.10/x
  3. Step 3: Cross multiply
    428.45x = 592.02 × 391.10
  4. Step 4: Simplify right side
    428.45x = 231,539.02
  5. Step 5: Solve for x
    x = 231,539.02/428.45
  6. Step 6: Final answer
    x = 540.41

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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.