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Finding the Fourth Proportional to 102,988.40, 154,223.40 and 67,737.20

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Solution

The fourth proportional to 102,988.40, 154,223.40 and 67,737.20 is: 101,435.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,988.40 : 154,223.40 = 67,737.20 : x
  2. Step 2: Convert to fraction form
    102,988.40/154,223.40 = 67,737.20/x
  3. Step 3: Cross multiply
    102,988.40x = 154,223.40 × 67,737.20
  4. Step 4: Simplify right side
    102,988.40x = 10,446,661,290.48
  5. Step 5: Solve for x
    x = 10,446,661,290.48/102,988.40
  6. Step 6: Final answer
    x = 101,435.32

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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.