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Finding the Fourth Proportional to 965.45, 1,447.81 and 372.40

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Solution

The fourth proportional to 965.45, 1,447.81 and 372.40 is: 558.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.45 : 1,447.81 = 372.40 : x
  2. Step 2: Convert to fraction form
    965.45/1,447.81 = 372.40/x
  3. Step 3: Cross multiply
    965.45x = 1,447.81 × 372.40
  4. Step 4: Simplify right side
    965.45x = 539,159.89
  5. Step 5: Solve for x
    x = 539,159.89/965.45
  6. Step 6: Final answer
    x = 558.45

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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.