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Finding the Fourth Proportional to 943.63, 1,415.36 and 318.87

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Solution

The fourth proportional to 943.63, 1,415.36 and 318.87 is: 478.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.63 : 1,415.36 = 318.87 : x
  2. Step 2: Convert to fraction form
    943.63/1,415.36 = 318.87/x
  3. Step 3: Cross multiply
    943.63x = 1,415.36 × 318.87
  4. Step 4: Simplify right side
    943.63x = 451,316.64
  5. Step 5: Solve for x
    x = 451,316.64/943.63
  6. Step 6: Final answer
    x = 478.28

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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.