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Finding the Fourth Proportional to 727.92, 1,005.48 and 631.44

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Solution

The fourth proportional to 727.92, 1,005.48 and 631.44 is: 872.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.92 : 1,005.48 = 631.44 : x
  2. Step 2: Convert to fraction form
    727.92/1,005.48 = 631.44/x
  3. Step 3: Cross multiply
    727.92x = 1,005.48 × 631.44
  4. Step 4: Simplify right side
    727.92x = 634,900.29
  5. Step 5: Solve for x
    x = 634,900.29/727.92
  6. Step 6: Final answer
    x = 872.21

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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.