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Finding the Fourth Proportional to 929, 1,391.52 and 639.56

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Solution

The fourth proportional to 929, 1,391.52 and 639.56 is: 957.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    929 : 1,391.52 = 639.56 : x
  2. Step 2: Convert to fraction form
    929/1,391.52 = 639.56/x
  3. Step 3: Cross multiply
    929x = 1,391.52 × 639.56
  4. Step 4: Simplify right side
    929x = 889,960.53
  5. Step 5: Solve for x
    x = 889,960.53/929
  6. Step 6: Final answer
    x = 957.98

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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.