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Finding the Fourth Proportional to 945, 1,304.12 and 531

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Solution

The fourth proportional to 945, 1,304.12 and 531 is: 732.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    945 : 1,304.12 = 531 : x
  2. Step 2: Convert to fraction form
    945/1,304.12 = 531/x
  3. Step 3: Cross multiply
    945x = 1,304.12 × 531
  4. Step 4: Simplify right side
    945x = 692,487.72
  5. Step 5: Solve for x
    x = 692,487.72/945
  6. Step 6: Final answer
    x = 732.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.