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Finding the Fourth Proportional to 438.95, 605.61 and 281.57

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Solution

The fourth proportional to 438.95, 605.61 and 281.57 is: 388.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.95 : 605.61 = 281.57 : x
  2. Step 2: Convert to fraction form
    438.95/605.61 = 281.57/x
  3. Step 3: Cross multiply
    438.95x = 605.61 × 281.57
  4. Step 4: Simplify right side
    438.95x = 170,521.71
  5. Step 5: Solve for x
    x = 170,521.71/438.95
  6. Step 6: Final answer
    x = 388.47

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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.