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Finding the Fourth Proportional to 281,445.80, 388,395.40 and 154,121.42

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Solution

The fourth proportional to 281,445.80, 388,395.40 and 154,121.42 is: 212,687.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,445.80 : 388,395.40 = 154,121.42 : x
  2. Step 2: Convert to fraction form
    281,445.80/388,395.40 = 154,121.42/x
  3. Step 3: Cross multiply
    281,445.80x = 388,395.40 × 154,121.42
  4. Step 4: Simplify right side
    281,445.80x = 59,860,050,569.47
  5. Step 5: Solve for x
    x = 59,860,050,569.47/281,445.80
  6. Step 6: Final answer
    x = 212,687.67

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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.