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Finding the Fourth Proportional to 78,718.80, 118,078.20 and 75,438.30

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Solution

The fourth proportional to 78,718.80, 118,078.20 and 75,438.30 is: 113,157.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,718.80 : 118,078.20 = 75,438.30 : x
  2. Step 2: Convert to fraction form
    78,718.80/118,078.20 = 75,438.30/x
  3. Step 3: Cross multiply
    78,718.80x = 118,078.20 × 75,438.30
  4. Step 4: Simplify right side
    78,718.80x = 8,907,618,675.06
  5. Step 5: Solve for x
    x = 8,907,618,675.06/78,718.80
  6. Step 6: Final answer
    x = 113,157.45

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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.