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Finding the Fourth Proportional to 78,015.40, 117,023.10 and 66,205.60

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Solution

The fourth proportional to 78,015.40, 117,023.10 and 66,205.60 is: 99,308.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,015.40 : 117,023.10 = 66,205.60 : x
  2. Step 2: Convert to fraction form
    78,015.40/117,023.10 = 66,205.60/x
  3. Step 3: Cross multiply
    78,015.40x = 117,023.10 × 66,205.60
  4. Step 4: Simplify right side
    78,015.40x = 7,747,584,549.36
  5. Step 5: Solve for x
    x = 7,747,584,549.36/78,015.40
  6. Step 6: Final answer
    x = 99,308.40

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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.