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Finding the Fourth Proportional to 281,616.30, 388,620.63 and 154,290.78

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Solution

The fourth proportional to 281,616.30, 388,620.63 and 154,290.78 is: 212,915.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,616.30 : 388,620.63 = 154,290.78 : x
  2. Step 2: Convert to fraction form
    281,616.30/388,620.63 = 154,290.78/x
  3. Step 3: Cross multiply
    281,616.30x = 388,620.63 × 154,290.78
  4. Step 4: Simplify right side
    281,616.30x = 59,960,580,126.79
  5. Step 5: Solve for x
    x = 59,960,580,126.79/281,616.30
  6. Step 6: Final answer
    x = 212,915.87

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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.