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Finding the Fourth Proportional to 281,718.90, 388,769.85 and 154,394.19

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Solution

The fourth proportional to 281,718.90, 388,769.85 and 154,394.19 is: 213,062.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,718.90 : 388,769.85 = 154,394.19 : x
  2. Step 2: Convert to fraction form
    281,718.90/388,769.85 = 154,394.19/x
  3. Step 3: Cross multiply
    281,718.90x = 388,769.85 × 154,394.19
  4. Step 4: Simplify right side
    281,718.90x = 60,023,806,087.17
  5. Step 5: Solve for x
    x = 60,023,806,087.17/281,718.90
  6. Step 6: Final answer
    x = 213,062.76

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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.