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Finding the Fourth Proportional to 1,288.49, 1,935 and 959.51

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Solution

The fourth proportional to 1,288.49, 1,935 and 959.51 is: 1,440.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.49 : 1,935 = 959.51 : x
  2. Step 2: Convert to fraction form
    1,288.49/1,935 = 959.51/x
  3. Step 3: Cross multiply
    1,288.49x = 1,935 × 959.51
  4. Step 4: Simplify right side
    1,288.49x = 1,856,656.69
  5. Step 5: Solve for x
    x = 1,856,656.69/1,288.49
  6. Step 6: Final answer
    x = 1,440.96

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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.