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Finding the Fourth Proportional to 78,465.95, 117,698.93 and 68,624.45

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Solution

The fourth proportional to 78,465.95, 117,698.93 and 68,624.45 is: 102,936.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,465.95 : 117,698.93 = 68,624.45 : x
  2. Step 2: Convert to fraction form
    78,465.95/117,698.93 = 68,624.45/x
  3. Step 3: Cross multiply
    78,465.95x = 117,698.93 × 68,624.45
  4. Step 4: Simplify right side
    78,465.95x = 8,077,023,993.72
  5. Step 5: Solve for x
    x = 8,077,023,993.72/78,465.95
  6. Step 6: Final answer
    x = 102,936.68

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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.