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Finding the Fourth Proportional to 316.32, 474.91 and 218.57

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Solution

The fourth proportional to 316.32, 474.91 and 218.57 is: 328.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.32 : 474.91 = 218.57 : x
  2. Step 2: Convert to fraction form
    316.32/474.91 = 218.57/x
  3. Step 3: Cross multiply
    316.32x = 474.91 × 218.57
  4. Step 4: Simplify right side
    316.32x = 103,802.22
  5. Step 5: Solve for x
    x = 103,802.22/316.32
  6. Step 6: Final answer
    x = 328.16

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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.