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Finding the Fourth Proportional to 964.50, 1,447.56 and 387.40

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Solution

The fourth proportional to 964.50, 1,447.56 and 387.40 is: 581.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.50 : 1,447.56 = 387.40 : x
  2. Step 2: Convert to fraction form
    964.50/1,447.56 = 387.40/x
  3. Step 3: Cross multiply
    964.50x = 1,447.56 × 387.40
  4. Step 4: Simplify right side
    964.50x = 560,784.74
  5. Step 5: Solve for x
    x = 560,784.74/964.50
  6. Step 6: Final answer
    x = 581.43

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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.