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Finding the Fourth Proportional to 78,453.96, 116,941.95 and 72,155.40

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Solution

The fourth proportional to 78,453.96, 116,941.95 and 72,155.40 is: 107,553.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,453.96 : 116,941.95 = 72,155.40 : x
  2. Step 2: Convert to fraction form
    78,453.96/116,941.95 = 72,155.40/x
  3. Step 3: Cross multiply
    78,453.96x = 116,941.95 × 72,155.40
  4. Step 4: Simplify right side
    78,453.96x = 8,437,993,179.03
  5. Step 5: Solve for x
    x = 8,437,993,179.03/78,453.96
  6. Step 6: Final answer
    x = 107,553.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.