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Finding the Fourth Proportional to 438.68, 657.09 and 316.58

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Solution

The fourth proportional to 438.68, 657.09 and 316.58 is: 474.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.68 : 657.09 = 316.58 : x
  2. Step 2: Convert to fraction form
    438.68/657.09 = 316.58/x
  3. Step 3: Cross multiply
    438.68x = 657.09 × 316.58
  4. Step 4: Simplify right side
    438.68x = 208,018.27
  5. Step 5: Solve for x
    x = 208,018.27/438.68
  6. Step 6: Final answer
    x = 474.20

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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.