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Finding the Fourth Proportional to 965.72, 1,449.12 and 389

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Solution

The fourth proportional to 965.72, 1,449.12 and 389 is: 583.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.72 : 1,449.12 = 389 : x
  2. Step 2: Convert to fraction form
    965.72/1,449.12 = 389/x
  3. Step 3: Cross multiply
    965.72x = 1,449.12 × 389
  4. Step 4: Simplify right side
    965.72x = 563,707.68
  5. Step 5: Solve for x
    x = 563,707.68/965.72
  6. Step 6: Final answer
    x = 583.72

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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.