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Finding the Fourth Proportional to 626.77, 938.18 and 430.62

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Solution

The fourth proportional to 626.77, 938.18 and 430.62 is: 644.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.77 : 938.18 = 430.62 : x
  2. Step 2: Convert to fraction form
    626.77/938.18 = 430.62/x
  3. Step 3: Cross multiply
    626.77x = 938.18 × 430.62
  4. Step 4: Simplify right side
    626.77x = 403,992.23
  5. Step 5: Solve for x
    x = 403,992.23/626.77
  6. Step 6: Final answer
    x = 644.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.