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Finding the Fourth Proportional to 77,968.50, 117,004.59 and 28,720.50

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Solution

The fourth proportional to 77,968.50, 117,004.59 and 28,720.50 is: 43,099.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,968.50 : 117,004.59 = 28,720.50 : x
  2. Step 2: Convert to fraction form
    77,968.50/117,004.59 = 28,720.50/x
  3. Step 3: Cross multiply
    77,968.50x = 117,004.59 × 28,720.50
  4. Step 4: Simplify right side
    77,968.50x = 3,360,430,327.10
  5. Step 5: Solve for x
    x = 3,360,430,327.10/77,968.50
  6. Step 6: Final answer
    x = 43,099.85

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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.