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Finding the Fourth Proportional to 438.64, 605.75 and 314.71

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Solution

The fourth proportional to 438.64, 605.75 and 314.71 is: 434.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.64 : 605.75 = 314.71 : x
  2. Step 2: Convert to fraction form
    438.64/605.75 = 314.71/x
  3. Step 3: Cross multiply
    438.64x = 605.75 × 314.71
  4. Step 4: Simplify right side
    438.64x = 190,632.49
  5. Step 5: Solve for x
    x = 190,632.49/438.64
  6. Step 6: Final answer
    x = 434.60

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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.