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Finding the Fourth Proportional to 929.72, 1,282.56 and 721.28

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Solution

The fourth proportional to 929.72, 1,282.56 and 721.28 is: 995.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.72 : 1,282.56 = 721.28 : x
  2. Step 2: Convert to fraction form
    929.72/1,282.56 = 721.28/x
  3. Step 3: Cross multiply
    929.72x = 1,282.56 × 721.28
  4. Step 4: Simplify right side
    929.72x = 925,084.88
  5. Step 5: Solve for x
    x = 925,084.88/929.72
  6. Step 6: Final answer
    x = 995.01

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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.