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Finding the Fourth Proportional to 462.90, 638.60 and 315.66

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Solution

The fourth proportional to 462.90, 638.60 and 315.66 is: 435.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.90 : 638.60 = 315.66 : x
  2. Step 2: Convert to fraction form
    462.90/638.60 = 315.66/x
  3. Step 3: Cross multiply
    462.90x = 638.60 × 315.66
  4. Step 4: Simplify right side
    462.90x = 201,580.48
  5. Step 5: Solve for x
    x = 201,580.48/462.90
  6. Step 6: Final answer
    x = 435.47

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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.