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Finding the Fourth Proportional to 78,718.40, 118,077.60 and 68,350.40

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Solution

The fourth proportional to 78,718.40, 118,077.60 and 68,350.40 is: 102,525.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,718.40 : 118,077.60 = 68,350.40 : x
  2. Step 2: Convert to fraction form
    78,718.40/118,077.60 = 68,350.40/x
  3. Step 3: Cross multiply
    78,718.40x = 118,077.60 × 68,350.40
  4. Step 4: Simplify right side
    78,718.40x = 8,070,651,191.04
  5. Step 5: Solve for x
    x = 8,070,651,191.04/78,718.40
  6. Step 6: Final answer
    x = 102,525.60

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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.