Home / 78,492,563.22-117,729,876.09-20,989,318.62

Finding the Fourth Proportional to 78,492,563.22, 117,729,876.09 and 20,989,318.62

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Solution

The fourth proportional to 78,492,563.22, 117,729,876.09 and 20,989,318.62 is: 31,481,579.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,492,563.22 : 117,729,876.09 = 20,989,318.62 : x
  2. Step 2: Convert to fraction form
    78,492,563.22/117,729,876.09 = 20,989,318.62/x
  3. Step 3: Cross multiply
    78,492,563.22x = 117,729,876.09 × 20,989,318.62
  4. Step 4: Simplify right side
    78,492,563.22x = 2,471,069,880,346,130
  5. Step 5: Solve for x
    x = 2,471,069,880,346,130/78,492,563.22
  6. Step 6: Final answer
    x = 31,481,579.64

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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.