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Finding the Fourth Proportional to 1,429.44, 1,971.36 and 964.32

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Solution

The fourth proportional to 1,429.44, 1,971.36 and 964.32 is: 1,329.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.44 : 1,971.36 = 964.32 : x
  2. Step 2: Convert to fraction form
    1,429.44/1,971.36 = 964.32/x
  3. Step 3: Cross multiply
    1,429.44x = 1,971.36 × 964.32
  4. Step 4: Simplify right side
    1,429.44x = 1,901,021.88
  5. Step 5: Solve for x
    x = 1,901,021.88/1,429.44
  6. Step 6: Final answer
    x = 1,329.91

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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.