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Finding the Fourth Proportional to 316.58, 438.58 and 309.02

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Solution

The fourth proportional to 316.58, 438.58 and 309.02 is: 428.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.58 : 438.58 = 309.02 : x
  2. Step 2: Convert to fraction form
    316.58/438.58 = 309.02/x
  3. Step 3: Cross multiply
    316.58x = 438.58 × 309.02
  4. Step 4: Simplify right side
    316.58x = 135,529.22
  5. Step 5: Solve for x
    x = 135,529.22/316.58
  6. Step 6: Final answer
    x = 428.10

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.