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Finding the Fourth Proportional to 438.72, 605.04 and 315.18

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Solution

The fourth proportional to 438.72, 605.04 and 315.18 is: 434.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.72 : 605.04 = 315.18 : x
  2. Step 2: Convert to fraction form
    438.72/605.04 = 315.18/x
  3. Step 3: Cross multiply
    438.72x = 605.04 × 315.18
  4. Step 4: Simplify right side
    438.72x = 190,696.51
  5. Step 5: Solve for x
    x = 190,696.51/438.72
  6. Step 6: Final answer
    x = 434.67

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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.