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Finding the Fourth Proportional to 85,322.80, 127,984.20 and 78,065.20

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Solution

The fourth proportional to 85,322.80, 127,984.20 and 78,065.20 is: 117,097.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,322.80 : 127,984.20 = 78,065.20 : x
  2. Step 2: Convert to fraction form
    85,322.80/127,984.20 = 78,065.20/x
  3. Step 3: Cross multiply
    85,322.80x = 127,984.20 × 78,065.20
  4. Step 4: Simplify right side
    85,322.80x = 9,991,112,169.84
  5. Step 5: Solve for x
    x = 9,991,112,169.84/85,322.80
  6. Step 6: Final answer
    x = 117,097.80

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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.