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Finding the Fourth Proportional to 103,361.40, 155,042.10 and 71,868.60

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Solution

The fourth proportional to 103,361.40, 155,042.10 and 71,868.60 is: 107,802.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,361.40 : 155,042.10 = 71,868.60 : x
  2. Step 2: Convert to fraction form
    103,361.40/155,042.10 = 71,868.60/x
  3. Step 3: Cross multiply
    103,361.40x = 155,042.10 × 71,868.60
  4. Step 4: Simplify right side
    103,361.40x = 11,142,658,668.06
  5. Step 5: Solve for x
    x = 11,142,658,668.06/103,361.40
  6. Step 6: Final answer
    x = 107,802.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.