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Finding the Fourth Proportional to 78,713.20, 118,069.80 and 66,903.40

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Solution

The fourth proportional to 78,713.20, 118,069.80 and 66,903.40 is: 100,355.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,713.20 : 118,069.80 = 66,903.40 : x
  2. Step 2: Convert to fraction form
    78,713.20/118,069.80 = 66,903.40/x
  3. Step 3: Cross multiply
    78,713.20x = 118,069.80 × 66,903.40
  4. Step 4: Simplify right side
    78,713.20x = 7,899,271,057.32
  5. Step 5: Solve for x
    x = 7,899,271,057.32/78,713.20
  6. Step 6: Final answer
    x = 100,355.10

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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.