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Finding the Fourth Proportional to 78,879.80, 118,319.70 and 72,428.60

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Solution

The fourth proportional to 78,879.80, 118,319.70 and 72,428.60 is: 108,642.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,879.80 : 118,319.70 = 72,428.60 : x
  2. Step 2: Convert to fraction form
    78,879.80/118,319.70 = 72,428.60/x
  3. Step 3: Cross multiply
    78,879.80x = 118,319.70 × 72,428.60
  4. Step 4: Simplify right side
    78,879.80x = 8,569,730,223.42
  5. Step 5: Solve for x
    x = 8,569,730,223.42/78,879.80
  6. Step 6: Final answer
    x = 108,642.90

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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.