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Finding the Fourth Proportional to 965.55, 1,447.79 and 316.23

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Solution

The fourth proportional to 965.55, 1,447.79 and 316.23 is: 474.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.55 : 1,447.79 = 316.23 : x
  2. Step 2: Convert to fraction form
    965.55/1,447.79 = 316.23/x
  3. Step 3: Cross multiply
    965.55x = 1,447.79 × 316.23
  4. Step 4: Simplify right side
    965.55x = 457,833.05
  5. Step 5: Solve for x
    x = 457,833.05/965.55
  6. Step 6: Final answer
    x = 474.17

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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.