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Finding the Fourth Proportional to 727.40, 1,004.24 and 491.76

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Solution

The fourth proportional to 727.40, 1,004.24 and 491.76 is: 678.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    727.40 : 1,004.24 = 491.76 : x
  2. Step 2: Convert to fraction form
    727.40/1,004.24 = 491.76/x
  3. Step 3: Cross multiply
    727.40x = 1,004.24 × 491.76
  4. Step 4: Simplify right side
    727.40x = 493,845.06
  5. Step 5: Solve for x
    x = 493,845.06/727.40
  6. Step 6: Final answer
    x = 678.92

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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.