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Finding the Fourth Proportional to 85,279.80, 127,919.70 and 78,022.20

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Solution

The fourth proportional to 85,279.80, 127,919.70 and 78,022.20 is: 117,033.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,279.80 : 127,919.70 = 78,022.20 : x
  2. Step 2: Convert to fraction form
    85,279.80/127,919.70 = 78,022.20/x
  3. Step 3: Cross multiply
    85,279.80x = 127,919.70 × 78,022.20
  4. Step 4: Simplify right side
    85,279.80x = 9,980,576,417.34
  5. Step 5: Solve for x
    x = 9,980,576,417.34/85,279.80
  6. Step 6: Final answer
    x = 117,033.30

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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.