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Finding the Fourth Proportional to 739.76, 1,021.08 and 478.04

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Solution

The fourth proportional to 739.76, 1,021.08 and 478.04 is: 659.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.76 : 1,021.08 = 478.04 : x
  2. Step 2: Convert to fraction form
    739.76/1,021.08 = 478.04/x
  3. Step 3: Cross multiply
    739.76x = 1,021.08 × 478.04
  4. Step 4: Simplify right side
    739.76x = 488,117.08
  5. Step 5: Solve for x
    x = 488,117.08/739.76
  6. Step 6: Final answer
    x = 659.83

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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.