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Finding the Fourth Proportional to 474.69, 712.08 and 128.02

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Solution

The fourth proportional to 474.69, 712.08 and 128.02 is: 192.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.69 : 712.08 = 128.02 : x
  2. Step 2: Convert to fraction form
    474.69/712.08 = 128.02/x
  3. Step 3: Cross multiply
    474.69x = 712.08 × 128.02
  4. Step 4: Simplify right side
    474.69x = 91,160.48
  5. Step 5: Solve for x
    x = 91,160.48/474.69
  6. Step 6: Final answer
    x = 192.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.