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Finding the Fourth Proportional to 78,651.99, 117,872.91 and 28,685.16

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Solution

The fourth proportional to 78,651.99, 117,872.91 and 28,685.16 is: 42,989.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,651.99 : 117,872.91 = 28,685.16 : x
  2. Step 2: Convert to fraction form
    78,651.99/117,872.91 = 28,685.16/x
  3. Step 3: Cross multiply
    78,651.99x = 117,872.91 × 28,685.16
  4. Step 4: Simplify right side
    78,651.99x = 3,381,203,283.02
  5. Step 5: Solve for x
    x = 3,381,203,283.02/78,651.99
  6. Step 6: Final answer
    x = 42,989.42

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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.