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Finding the Fourth Proportional to 943.72, 1,415.13 and 395.76

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Solution

The fourth proportional to 943.72, 1,415.13 and 395.76 is: 593.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.72 : 1,415.13 = 395.76 : x
  2. Step 2: Convert to fraction form
    943.72/1,415.13 = 395.76/x
  3. Step 3: Cross multiply
    943.72x = 1,415.13 × 395.76
  4. Step 4: Simplify right side
    943.72x = 560,049.59
  5. Step 5: Solve for x
    x = 560,049.59/943.72
  6. Step 6: Final answer
    x = 593.45

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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.