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Finding the Fourth Proportional to 386.16, 532.36 and 312.36

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Solution

The fourth proportional to 386.16, 532.36 and 312.36 is: 430.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.16 : 532.36 = 312.36 : x
  2. Step 2: Convert to fraction form
    386.16/532.36 = 312.36/x
  3. Step 3: Cross multiply
    386.16x = 532.36 × 312.36
  4. Step 4: Simplify right side
    386.16x = 166,287.97
  5. Step 5: Solve for x
    x = 166,287.97/386.16
  6. Step 6: Final answer
    x = 430.62

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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.