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Finding the Fourth Proportional to 615.87, 922.73 and 430.38

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Solution

The fourth proportional to 615.87, 922.73 and 430.38 is: 644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.87 : 922.73 = 430.38 : x
  2. Step 2: Convert to fraction form
    615.87/922.73 = 430.38/x
  3. Step 3: Cross multiply
    615.87x = 922.73 × 430.38
  4. Step 4: Simplify right side
    615.87x = 397,122.39
  5. Step 5: Solve for x
    x = 397,122.39/615.87
  6. Step 6: Final answer
    x = 644.82

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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.