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Finding the Fourth Proportional to 84,830.80, 127,246.20 and 78,415.60

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Solution

The fourth proportional to 84,830.80, 127,246.20 and 78,415.60 is: 117,623.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,830.80 : 127,246.20 = 78,415.60 : x
  2. Step 2: Convert to fraction form
    84,830.80/127,246.20 = 78,415.60/x
  3. Step 3: Cross multiply
    84,830.80x = 127,246.20 × 78,415.60
  4. Step 4: Simplify right side
    84,830.80x = 9,978,087,120.72
  5. Step 5: Solve for x
    x = 9,978,087,120.72/84,830.80
  6. Step 6: Final answer
    x = 117,623.40

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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.