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Finding the Fourth Proportional to 316.40, 474.60 and 172.16

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Solution

The fourth proportional to 316.40, 474.60 and 172.16 is: 258.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.40 : 474.60 = 172.16 : x
  2. Step 2: Convert to fraction form
    316.40/474.60 = 172.16/x
  3. Step 3: Cross multiply
    316.40x = 474.60 × 172.16
  4. Step 4: Simplify right side
    316.40x = 81,707.14
  5. Step 5: Solve for x
    x = 81,707.14/316.40
  6. Step 6: Final answer
    x = 258.24

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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.