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Finding the Fourth Proportional to 428.44, 639.56 and 373.76

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Solution

The fourth proportional to 428.44, 639.56 and 373.76 is: 557.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.44 : 639.56 = 373.76 : x
  2. Step 2: Convert to fraction form
    428.44/639.56 = 373.76/x
  3. Step 3: Cross multiply
    428.44x = 639.56 × 373.76
  4. Step 4: Simplify right side
    428.44x = 239,041.95
  5. Step 5: Solve for x
    x = 239,041.95/428.44
  6. Step 6: Final answer
    x = 557.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.