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Finding the Fourth Proportional to 1,315.39, 1,971.20 and 965.98

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Solution

The fourth proportional to 1,315.39, 1,971.20 and 965.98 is: 1,447.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.39 : 1,971.20 = 965.98 : x
  2. Step 2: Convert to fraction form
    1,315.39/1,971.20 = 965.98/x
  3. Step 3: Cross multiply
    1,315.39x = 1,971.20 × 965.98
  4. Step 4: Simplify right side
    1,315.39x = 1,904,147.12
  5. Step 5: Solve for x
    x = 1,904,147.12/1,315.39
  6. Step 6: Final answer
    x = 1,447.59

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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.