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Finding the Fourth Proportional to 727.08, 1,003.20 and 491.47

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Solution

The fourth proportional to 727.08, 1,003.20 and 491.47 is: 678.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.08 : 1,003.20 = 491.47 : x
  2. Step 2: Convert to fraction form
    727.08/1,003.20 = 491.47/x
  3. Step 3: Cross multiply
    727.08x = 1,003.20 × 491.47
  4. Step 4: Simplify right side
    727.08x = 493,037.69
  5. Step 5: Solve for x
    x = 493,037.69/727.08
  6. Step 6: Final answer
    x = 678.11

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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.