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Finding the Fourth Proportional to 139,728.20, 209,592.30 and 100,653.80

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Solution

The fourth proportional to 139,728.20, 209,592.30 and 100,653.80 is: 150,980.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.20 : 209,592.30 = 100,653.80 : x
  2. Step 2: Convert to fraction form
    139,728.20/209,592.30 = 100,653.80/x
  3. Step 3: Cross multiply
    139,728.20x = 209,592.30 × 100,653.80
  4. Step 4: Simplify right side
    139,728.20x = 21,096,261,445.74
  5. Step 5: Solve for x
    x = 21,096,261,445.74/139,728.20
  6. Step 6: Final answer
    x = 150,980.70

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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.