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Finding the Fourth Proportional to 964.47, 1,447.05 and 387.39

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Solution

The fourth proportional to 964.47, 1,447.05 and 387.39 is: 581.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.47 : 1,447.05 = 387.39 : x
  2. Step 2: Convert to fraction form
    964.47/1,447.05 = 387.39/x
  3. Step 3: Cross multiply
    964.47x = 1,447.05 × 387.39
  4. Step 4: Simplify right side
    964.47x = 560,572.70
  5. Step 5: Solve for x
    x = 560,572.70/964.47
  6. Step 6: Final answer
    x = 581.22

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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.