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Finding the Fourth Proportional to 103,639.58, 155,436.15 and 40,461.20

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Solution

The fourth proportional to 103,639.58, 155,436.15 and 40,461.20 is: 60,682.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.58 : 155,436.15 = 40,461.20 : x
  2. Step 2: Convert to fraction form
    103,639.58/155,436.15 = 40,461.20/x
  3. Step 3: Cross multiply
    103,639.58x = 155,436.15 × 40,461.20
  4. Step 4: Simplify right side
    103,639.58x = 6,289,133,152.38
  5. Step 5: Solve for x
    x = 6,289,133,152.38/103,639.58
  6. Step 6: Final answer
    x = 60,682.73

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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.