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Finding the Fourth Proportional to 630.74, 871.14 and 420.56

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Solution

The fourth proportional to 630.74, 871.14 and 420.56 is: 580.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.74 : 871.14 = 420.56 : x
  2. Step 2: Convert to fraction form
    630.74/871.14 = 420.56/x
  3. Step 3: Cross multiply
    630.74x = 871.14 × 420.56
  4. Step 4: Simplify right side
    630.74x = 366,362.28
  5. Step 5: Solve for x
    x = 366,362.28/630.74
  6. Step 6: Final answer
    x = 580.85

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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.