Home / 103,640.15-155,460.23-78,756.95

Finding the Fourth Proportional to 103,640.15, 155,460.23 and 78,756.95

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Solution

The fourth proportional to 103,640.15, 155,460.23 and 78,756.95 is: 118,135.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,640.15 : 155,460.23 = 78,756.95 : x
  2. Step 2: Convert to fraction form
    103,640.15/155,460.23 = 78,756.95/x
  3. Step 3: Cross multiply
    103,640.15x = 155,460.23 × 78,756.95
  4. Step 4: Simplify right side
    103,640.15x = 12,243,573,561.10
  5. Step 5: Solve for x
    x = 12,243,573,561.10/103,640.15
  6. Step 6: Final answer
    x = 118,135.43

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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.