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Finding the Fourth Proportional to 943.68, 1,415.72 and 395.58

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Solution

The fourth proportional to 943.68, 1,415.72 and 395.58 is: 593.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.68 : 1,415.72 = 395.58 : x
  2. Step 2: Convert to fraction form
    943.68/1,415.72 = 395.58/x
  3. Step 3: Cross multiply
    943.68x = 1,415.72 × 395.58
  4. Step 4: Simplify right side
    943.68x = 560,021.46
  5. Step 5: Solve for x
    x = 560,021.46/943.68
  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.