Home / 78,145.14-117,280.54-40,716.40

Finding the Fourth Proportional to 78,145.14, 117,280.54 and 40,716.40

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Solution

The fourth proportional to 78,145.14, 117,280.54 and 40,716.40 is: 61,107.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,145.14 : 117,280.54 = 40,716.40 : x
  2. Step 2: Convert to fraction form
    78,145.14/117,280.54 = 40,716.40/x
  3. Step 3: Cross multiply
    78,145.14x = 117,280.54 × 40,716.40
  4. Step 4: Simplify right side
    78,145.14x = 4,775,241,378.86
  5. Step 5: Solve for x
    x = 4,775,241,378.86/78,145.14
  6. Step 6: Final answer
    x = 61,107.34

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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.