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Finding the Fourth Proportional to 78,505.84, 117,790.22 and 28,589.41

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Solution

The fourth proportional to 78,505.84, 117,790.22 and 28,589.41 is: 42,895.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,505.84 : 117,790.22 = 28,589.41 : x
  2. Step 2: Convert to fraction form
    78,505.84/117,790.22 = 28,589.41/x
  3. Step 3: Cross multiply
    78,505.84x = 117,790.22 × 28,589.41
  4. Step 4: Simplify right side
    78,505.84x = 3,367,552,893.57
  5. Step 5: Solve for x
    x = 3,367,552,893.57/78,505.84
  6. Step 6: Final answer
    x = 42,895.57

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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.