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Finding the Fourth Proportional to 78,611.58, 117,858.96 and 70,690.86

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Solution

The fourth proportional to 78,611.58, 117,858.96 and 70,690.86 is: 105,983.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,611.58 : 117,858.96 = 70,690.86 : x
  2. Step 2: Convert to fraction form
    78,611.58/117,858.96 = 70,690.86/x
  3. Step 3: Cross multiply
    78,611.58x = 117,858.96 × 70,690.86
  4. Step 4: Simplify right side
    78,611.58x = 8,331,551,241.11
  5. Step 5: Solve for x
    x = 8,331,551,241.11/78,611.58
  6. Step 6: Final answer
    x = 105,983.77

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1.5x scale

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.