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Finding the Fourth Proportional to 386.04, 578.88 and 129.48

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Solution

The fourth proportional to 386.04, 578.88 and 129.48 is: 194.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.04 : 578.88 = 129.48 : x
  2. Step 2: Convert to fraction form
    386.04/578.88 = 129.48/x
  3. Step 3: Cross multiply
    386.04x = 578.88 × 129.48
  4. Step 4: Simplify right side
    386.04x = 74,953.38
  5. Step 5: Solve for x
    x = 74,953.38/386.04
  6. Step 6: Final answer
    x = 194.16

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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.