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Finding the Fourth Proportional to 1,399.77, 1,929.44 and 951.51

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Solution

The fourth proportional to 1,399.77, 1,929.44 and 951.51 is: 1,311.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.77 : 1,929.44 = 951.51 : x
  2. Step 2: Convert to fraction form
    1,399.77/1,929.44 = 951.51/x
  3. Step 3: Cross multiply
    1,399.77x = 1,929.44 × 951.51
  4. Step 4: Simplify right side
    1,399.77x = 1,835,876.70
  5. Step 5: Solve for x
    x = 1,835,876.70/1,399.77
  6. Step 6: Final answer
    x = 1,311.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.