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Finding the Fourth Proportional to 386.88, 581.76 and 296.16

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Solution

The fourth proportional to 386.88, 581.76 and 296.16 is: 445.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.88 : 581.76 = 296.16 : x
  2. Step 2: Convert to fraction form
    386.88/581.76 = 296.16/x
  3. Step 3: Cross multiply
    386.88x = 581.76 × 296.16
  4. Step 4: Simplify right side
    386.88x = 172,294.04
  5. Step 5: Solve for x
    x = 172,294.04/386.88
  6. Step 6: Final answer
    x = 445.34

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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.