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Finding the Fourth Proportional to 103,639.15, 155,458.73 and 78,755.95

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Solution

The fourth proportional to 103,639.15, 155,458.73 and 78,755.95 is: 118,133.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,639.15 : 155,458.73 = 78,755.95 : x
  2. Step 2: Convert to fraction form
    103,639.15/155,458.73 = 78,755.95/x
  3. Step 3: Cross multiply
    103,639.15x = 155,458.73 × 78,755.95
  4. Step 4: Simplify right side
    103,639.15x = 12,243,299,966.94
  5. Step 5: Solve for x
    x = 12,243,299,966.94/103,639.15
  6. Step 6: Final answer
    x = 118,133.93

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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.